Dr. Ranjan Kumar Singh

Professor
Ph D (BHU)
Contact Information:
Tel. +91 542 6701569 Fax:+91 542 2368174
Email Id:[email protected]

 
 
Academic Qualifications:
 
S. No.DegreeInstitutionYear
1.B.Sc.Patna University1983
2.M.Sc.Patna University1986
3.Ph. D.Banaras Hindu University1994
 
Area of specialization: Electronic and vibrational spectroscopy. Spectroscopic study of metabolic reactions, hydrogen bonds, drug reactions and liquid crystallines
 

The area of research is the application of Raman spectroscopy and density functional theory to study the liquid crystalline materials, strongly interacting liquid mixtures and biological systems.
(a) Study of phase transitions and molecular dynamics of liquid crystalline phase transitions: The transitions are characterized by measuring temperature dependent Raman spectra. Phase transitions in liquid crystals are associated with large scale changes in molecular structure and orientation. These changes essentially induce changes in the Raman spectra. The transitions are depicted as change in intensity, wavenumber, appearance and disappearance of peaks and change in linewidth of some marker bands. Since the origin of Raman spectra lies in atomic displacements during the vibration, useful information about the molecular dynamics can be obtained.
(b) Study of the nature of hydrogen bonds: We prepare mixtures of various hydrogen bonding chemicals in liquid form at various concentrations and do Raman study and DFT calculations to study the nature of hydrogen bonds.
(c) SERS study of biological systems: We prepare the nano colloidals of various shape and size of coinage metals and use them for SERS enhancement for biological systems.
Awards:
* Alexander von Humboldt Fellow.

 
Projects Undertaken as PI/ Co PI:
 

S. No.Name of the Project DurationSource of FundingAmount of Funding (Rs)
1. Vibrational (Raman and IR spectroscopic IR) study of biologically important associated systems. 2006- 2009UGC, New Delhi6.17 lakh
2Surface enhanced Raman scattering using metal colloids nanoparticles: Application to Raman studies of single molecule 2008-2011DST, New Delhi 35.56 lakh
3Spectroscopic study of molecular dynamics at phase transition of thermotropic liquid crystals2008- 2011 CSIR, New Delhi15.22 Lakh
 
Any additional information:
 

List of 10 major Publications:

  1. Poornima Sharma, Debraj Gangopadhyay, Phool Chand Mishra, Hirdyesh Mishra, Ranjan K Singh, Detection of in Vitro Metabolite Formation of Leflunomide: A Fluorescence Dynamics and Electronic Structure Study, Journal of Medicinal Chemistry 59(2016)3418-3426, DOI: 10.1021/acs.jmedchem.6b00088
  2. Om Prakash, Shiv Kumar, Pushkar Singh, Volker Deckert, Sandip Chatterjee, A.K. Ghosh, Ranjan K Singh, Surface-enhanced Raman scattering characteristics of CuO : Mn/Ag heterojunction probed by methyl orange: effect of Mn 2+ doping, Journal of Raman Spectroscopy, 47 (2016) 813-818 , DOI: 10.1002/jrs.4904
  3. Anurag Singh, Debraj Gangopadhyay, Rajib Nandi, Poornima Sharma, Ranjan K Singh, Raman signatures of strong and weak hydrogen bonds in binary mixtures of phenol with acetonitrile, benzene and orthodichlorobenzene, Journal of Raman Spectroscopy, 47 (2016) 712-719 , DOI: 10.1002/jrs.4880
  4. Debraj Gangopadhyay, Poornima Sharma, Dr. Sachin Kumar Singh, Pushkar Singh, Volker Deckert, J�rgen Popp, Ranjan K Singh, Surface enhanced Raman scattering based reaction monitoring of: In vitro decyclization of creatinine ? creatine, RSC Advances 6(64) (2016) 58943-58949, DOI: 10.1039/C6RA03674K
  5. Ranjana Singh, Sunil Kumar Rai, Manish Kumar Tiwari, Anurag Mishra, Ashish K. Tewari, Phool Chand Mishra, Ranjan K Singh, An excellent stable fluorescent probe: Selective and sensitive detection of trace amounts of Hg +2 ions in natural source of water, Chemical Physics Letters 676(2017) 39-45, DOI: 10.1016/j.cplett.2017.03.046.
  6. Ranjana Singh Sunayana Kashyap Vimal Singh Arvind M Kayastha Hirdyesh Mishra Preeti S. Saxena Anchal Srivastava Ranjan K Singh, QPRTase modified N-doped carbon quantum dots: A fluorescent bioprobe for selective detection of neurotoxin quinolinic acid in human serum, Biosensors & Bioelectronics 101 (2018) 103-109. DOI: 10.1016/j.bios.2017.10.017
  7. Debraj Gangopadhyay, Poornima Sharma, Keshav singh, Moumita Das , Poonam Tandon, Ranjan K Singh, Monitoring the In Vitro Thiazolidine Ring Formation of Antioxidant Drug N-Acetyl-L-Cysteine at Basic pH and Detection of Reaction Intermediates: A Raman Spectroscopic and Ab Initio Study, J. Phys. Chem. B, 2018, 122 (45), pp 10306-10314, DOI: 10.1021/acs.jpcb.8b08512
  8. Liquid crystal based sensor system for the real time detection of mercuric ions in water using amphiphilic dithiocarbamate, Sachin Kumar Singh, Rajib Nandi, Kirtika Mishra, Hemant Kumar Singh, Ranjan K. Singh and Bachcha Singh, Sensor and Actuators B: Chemical 226 (2016) 381-387.
  9. Probing the orientations of coordination complex molecules onto thesurface of ZnO nanoparticles by means of surface enhanced Raman scattering, UV�vis and DFT methods, Om Prakash, Priyanka Gautam, Ranjan K. Singh, Appl Surface Science, 349 (2015) 657-664.
  10. Raman spectroscopic approach to monitor the in vitro cyclization ofcreatine ? creatinine, Debraj Gangopadhyaya, Poornima Sharma, Sachin Kumar Singh, Pushkar Singh, Nicolae Tarcea, Volker Deckert, J�rgen Popp, Ranjan K. Singh; Chemical Physics Letters 618 (2015) 225-230; http://dx.doi.org/10.1016/j.cplett.2014.11.021. .
Full List of Publications:
  1. Singh Ranjan K., Asthana B.P. and Bist H.D.: Study of the dynamics of phase transition in NH4SCN by a precise Raman linewidth and frequency shift measurement. Chem. Phys. Lett. 209, 390-396 (1993).
  2. Singh Ranjan K., Singh S.N., Asthana B.P., and Pathak C.M.: Deconvolution of Lorentzian Raman linewidth � method of polynomial fitting and extrapolation. J. Raman Spectrosc. 25, 423-428 (1994).
  3. Singh Ranjan K., Asthana B.P., Verma A.L. and Pathak C.M.: Raman study of the concentration dependence of the frequency shift and linewidth changes in a 3Clp + methanol system. Chem. Phys. Lett. 278, 35-40 (1997).
  4. Singh Ranjan K. and Verma A.L.: Estimation of slit width from the observed Raman spectra. J. Raman Spectrosc. 28, 301-304 (1997).
  5. Dash S.K., Singh Ranjan K., Alapati P.R. and Verma A.L.: Dynamics of phase transition in liquid crystalline compouund TBDA probed by Raman spectroscopy: J. Phys.: Condens Matter 9, 7809-7815 (1997).
  6. Singh Ranjan K., Asthana B.P., Singh P.R., Chakraborty T and Verma A.L.: Raman study of the vibrational relaxation of the ? (C ? N) stretching mode of acrylonitrile in binary liquid mixtuures with hydrogen donor solvents. J. Raman Spectrosc. 29, 561-566 (1998).
  7. Bhriguvansh P., Singh Ranjan K., Asthana B.P., and Verma A.L.,: Estimation of Lorentzian linewidth, fraction Lorentzian character and spectral slit width using different Raman lineshape parameters: Asian J. Phys. (Raman special issue edited by W. Kiefer) 7, 323-330 (1998).
  8. Dash S.K., Singh Ranjan K., Alapati P.R. and Verma A.L.: Laser Raman study of terepthalydene-bis-p-n-decylaniline (TBDA). Mol. Cryst. Liq. Cryst. 319, 147-158 (1998).
  9. Singh Ranjan K., Bhriguvansh P., Asthana B.P., and Verma A.L.,: Raman study of vibrational dephasing in hydrogen bonded binary and ternary complexes of C6H5Cl and methanol. Chem. Phys. Lett. 296, 611-618 (1998).
  10. Dash S.K., Singh Ranjan K., Alapati P.R. and Verma A.L.: Laser Raman study on thermotropic liquid crystalline compounds. Liq. Cryst. 25, 459-465 (1998).
  11. Dash S.K., Singh Ranjan K., Asthana B.P., Alapati P.R. and Verma A.L.: A new phase transition in super cooled TBDA probed by low temperature Raman study. J. Raman Spectrosc. 30, 81-84 (1999).
  12. Dash S.K., Alapati P.R., Singh Ranjan K. and Verma A.L.: Dynamics of low temperature phase transition in liquid crystal TB10A probed by Raman spectroscopy. Liq. Cryst. 26, 1479-1484 (1999).
  13. Singh Ranjan K., Singh S.C., Dash S.K., Asthana B.P. and Verma A.L.: Study of high temperature Raman sensitive mode of TBDA at solid � SmG transition. J. Raman Spectrosc. 31, 543-546 (2000).
  14. Dash S. K., Singh Ranjan K., Alapati P. R., Verma A. L.: Pre-resonance Raman studies of some mesogens-TB4A, TB7A and TB10A. Liq. Cryst. 27, 269-276 (2000).
  15. Schl�cker S., Singh Ranjan K., Asthana B.P., Popp J. and Kiefer W.: Hydrogen bonded pyridine-water complexes studied by density functional theory and Raman spectroscopy. J. Phys. Chem. A, 105, 9983-9989 (2001).
  16. Schl�cker S., Heid M., Singh Ranjan. K., Asthana B.P., Popp J. and Kiefer W.: Vibrational dynamics in hydrogen bonded (pyridine + water) complexes studied by spectrally resolved femtosecond CARS. Z. Phys. Chem. 216, 267-178 (2002).
  17. Singh Ranjan. K., Schl�cker S., Asthana B.P. and Kiefer W.: Raman investigation of low temperature phase transition in liquid crystalline system: terepthalidine-bis-heptylaniline (TB7A). J. Raman Spectrosc. 33, 720-725 (2002).
  18. Singh Ranjan. K., Schl�cker S., Asthana B.P. and Kiefer W.: Crystal-Smectic G transformation investigated by temperature-dependent Raman study. Applied Spectosc. 57, 1288-1294 (2003).
  19. Raguvansh P, Srivastava S. K., Singh Ranjan. K., Asthana B.P. and Kiefer W.: Hydrogen bonding and self-association investigated in the binary mixture (C6H5C=N + CH3OH) via concentration dependent Raman study of the C=N stretching mode of benzonitrile (C6H5C=N) and ab-initio calculations. Phys. Chem. Chem. Phys., 6, 531-536 (2004).
  20. Singh Ranjan K., Srivastava S. K., Ojha A.K., Arvind U. and Asthana B.P: Study of vibrational dephasing of (C-Cl) stretching mode of 2Cl-pyridine and 3Cl- pyridine in methanol environment by polarized Raman study and DFT calculations. J. Raman Spectrosc. 37, 76-84 (2006).
  21. Srivastava S. K., Ojha A.K., Sinha P.K., Asthana B.P and Singh Ranjan K.: Probing self associated structures of the solute molecule, acrylonitrile, the solvent molecule 2Cl-phenol and their binary complexes via concentration dependent Raman study and DFT calculation. J. Raman Spectrosc. 37, 68-75 (2006).
  22. Ojha A.K., Srivastava S. K., Singh Ranjan K. and Asthana B.P: A new approach to explain concentration dependent changes in linewidth and frequncy shifts in associated mixtures. J. Phys. Chem A. 110, 9849-9853 (2006).
  23. Ojha Animesh K., Singha, A., Dasgupta, S., Singh, Ranjan K., and Roy, A. pH dependent surface enhanced Raman study of Phe + Ag Complex and DFT calculations for spectral analysis. Chem. Phys. Lett. 431, 121-126 (2006).
  24. Ojha A.K., Srivastava S. K., Singh Ranjan K. and Asthana B.P: Concentration dependent Raman study of non-coincidence splitting in NH2 bending and C=O stretching modes of HCONH2 in binary mixture (HCONH2+CH3OH). J. Raman Spectrosc. 38, 159-165 (2007).
  25. Ojha A. K., Srivastava S. K., Singh Ranjan K., Kiefer W. and Asthana B. P.,Complex formation of HCONH2 in CH3�OH environment and investigation of linewidth change of ?(C=O) stretching and NH2 bending modes. Vibrational Spectroscopy 43, 177-183 (2007).
  26. Schlu1cker S., Koster J., Singh Ranjan K. and Asthana B. P. Hydrogen-Bonding between Pyrimidine and Water: A Vibrational Spectroscopic Analysis, J. Phys. Chem. A 111, 5185-5191(2007).
  27. Ojha A.K. ,Srivastava S.K., Schlucker S., Kiefer W., Asthana B.P and Singh Ranjan K,: Improper hydrogen Bonding Motional Narrowing in in binary mixtures of 2- and 3-bromopyridine in methanol probed by polarized polarized Raman and DFT calculations. J. Raman Spectrosc. 38, 1656-1664(2007).
  28. Mishra, S., Ojha, A.K., Singh D., Prasad R.R., Srivastava, S.K., and Singh, Ranjan K.: Concentration dependent surface enhanced Raman scattering and molecular dynamic study of dimethyl formamide. J. Raman Spectrosc. 38, 1454-1460 (2007).
  29. Singh, D., Srivastava, S.K., Ojha, A.K., Asthana, B. P., and Singh, Ranjan K. : DFT study of hydrogen bond bridging mode of pyridine and diazenes in water environment: J. Mol. Struct. Theochem 819, 88-94 (2007).
  30. Ojha Animesh K.and Singh Ranjan K., Optical Absorption Spectra of Copper, Silver and Gold Nanorods as a Function of Aspect Ratios and Medium Dielectric Constant: A Theoretical Study: J. Comp., 5, 1-8, (2008).
  31. Singh, D., Ojha, A.K., Kiefer W. and Ranjan K. Singh, Raman and DFT study of static, dynamic interactions and isotope effect in pyridazine+H2O/D2O systems , Vib. Spectrosc., 49, 242-250 (2008).
  32. Singh, D., Vikram K., Singh D.K., Kiefer W. and Singh, Ranjan K., Raman study of hydrogen-bonded 2- and 3-chloropyridine with methanol, J. Raman Spectrosc., 39,1423-1432 (2008).
  33. Vikram K., Srivastava S.K., Ojha A.K., Schlucker S., Kiefer W. and Singh Ranjan K., Dynamics and mechanism of the Crystal II?smecticG phase transition in TB7A by a temperature-dependent micro-Raman study and DFT calculations; J. Raman Spectrosc. 40, 881-886 (2009).
  34. Mishra S., Singh Ranjan. K., Ojha A.K., Investigation on bonding interaction of benzonitrile with silver nano particles probed by surface enhanced Raman scattering and quantum chemical calculations, Chem. Phys., 355, 14-20 (2009).
  35. Vikram K., Tarcea Nicolae., Srivastava S.K., B.P. Asthana, J. Popp and Ranjan K. Singh*, Crystal? nematic phase transition in liquid crystalline system 1-Isothiocyanato-4-(trans-4-propylcyclohexyl) benzene (3CHBT) probed by temperature dependent micro-Raman study and DFT calculations, J.Raman Spectrosc. . 41, 1067-1075 (2010).
  36. Vikram K., Tarcea N., Popp J. and Singh Ranjan K. , Temperature dependent Raman study of the Smectic (S)? Nematic (N) phase transition and vibrational analysis using DFT of liquid crystalline system 4-decloxy benzoic acid (4DBA) Applied Spectroscopy, 64(2), 187-194 (2010).
  37. Mishra S., Singh D.K., Ojha A.K., Asthana B.P, Singh Ranjan K., Raman and DFT study of polar ?(C=N) and non-polar ?(C-H) modes of acetonitrile in aqueous Ag nano-colloids, Spectrochim Acta. Spectrochim. Acta A 77, 559-565 (2010).
  38. K. Vikram, P.R. Alapati and Ranjan K. Singh, Temperature dependent Raman study of SB ? SC transition in liquid crystalline compound N-(4-n-pentyloxybenzylidene)-4'-heptylaniline (5O.7) Spectrochim Acta. 75(5), 1480-1485 (2010).
  39. Singh D.K., Mishra S., Ojha A.K., Srivastava S.K., Schl�cker S., Asthana B.P., Popp J. and Singh Ranjan K. *, Hydrogen bonding in different pyrimidine- methanol clusters probed by polarized Raman spectroscopy and DFT calculations, J. Raman Spectrosc. 2011, 42, 667-675.
  40. Singh D.K., Srivastava S.K., Schl�cker S., Singh Ranjan.K., Asthana B.P., Self-association and hydrogen bonding of propionaldehyde in binary mixtures with water and methanol investigated by concentration dependent polarized Raman study and DFT calculations. J. Raman Spectrosc. 42 851-858 (2011).
  41. Singh D.K., Srivastava S.K., Raghuvansh P., Singh Ranjan K., Asthana B.P., Inter�molecular hydrogen bonding in the binary mixture [(C2H5)2C=O + CH3OH] probed by polarized Raman measurements and DFT calculations. Vibr. Spectrosc. 56 34-41 (2011).
  42. Mishra S., Meyer T., Popp . and Singh Ranjan K., Precise Analysis of Small Wavenumber Shifts of Pyridine on Dilution with H2O and D2O Using RDS Technique. Z. Phys. Chem, 225 673-689 (2011).
  43. Singh D., Popp J. and Singh Ranjan K., Fourier Transform Raman and DFT Study of Blue Shift C-H Stretching Vibration of Diazinees on Hydrogen Bond Formation, , Z. Phys. Chem, 225 785-798 (2011).
  44. Saini G.S.S., Dogra S.D., Sharma K., Singh S., Tripathi S.K., Sathe V. and Singh Ranjan K., Experimental and density functional theoretical study of the effects of chemical vapours on the vibrational spectra of nickel phthalocyanine thin films, Vibrational Spectroscopy 57 (2011) 61-71.
  45. Structural and optical properties of sol-gel derived nanocrystalline Fe-doped ZnO Shiv Kumar, Subhrajit Mukherjee, Ranjan Kr. Singh, S. Chatterjee, and A. K. Ghosh J. Appl. Phys. 110, 103508 (2011).
  46. Vikram K., Mishra S., Srivastava S.K., Singh Ranjan K.: Low Temperature Raman and DFT study of Creatinine. Journal of Molecular Structure 1012, 141�150, doi:10.1016/j.molstruc.2011.11.018.
  47. Effect of deuteration on hydrogen bonding: A comparative concentration dependent Raman and DFT study of pyridine in CH3OH and CD3OD and pyrimidine in H2O and D2O, Anurag Singh, Debraj Gangopadhyay, J�rgen Popp, Ranjan K. Singh, Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy 99 (2012) 136-143, http://dx.doi.org/10.1016/j.saa.2012.09.021.
  48. Low temperature Raman study of a liquid crystalline system 4-Decyloxy benzoic acid (4DBA), K. Vikram, Rajib Nandi, Ranjan K. Singh, Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy 112 (2013) 377�383. http://dx.doi.org/10.1016/j.saa.2013.03.009.
  49. Structural and optical properties of ZnO and ZnO:Fe nanoparticles under dense electronic excitations; Shiv Kumar, K. Asokan, Ranjan Kr. Singh, S. Chatterjee, D. Kanjilal and Anup K. Ghosh, JOURNAL OF APPLIED PHYSICS 114, 164321 (2013). http://dx.doi.org/10.1063/1.4826525.
  50. Defects in Zn1_x_yCoxMgyO nanoparticles: Probed by XRD, RAMAN and PAS techniques, V.P. Singh, R.K. Singh, D. Das, Chandana Rath, Materials Science in Semiconductor Processing 16 (2013) 659�666, http://dx.doi.org/10.1016/j.mssp.2012.12.006.
  51. Solvent dependent frequency shift and Raman noncoincidence effect of S=O stretching mode of Dimethyl sulfoxide in liquid binary mixtures, Ganesh Upadhyay, Th. Gomti Devi, Ranjan K. Singh, A. Singh, P.R. Alapati, Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy 109 (2013) 239-246, http://dx.doi.org/10.1016/j.saa.2013.02.046.
  52. Investigation of coordination properties of isolated adenine to copper metal: A systematic spectroscopic and DFT study, Om Prakash, Sachin Kumar Singh, Bachcha Singh, Ranjan K. Singh, Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy 112 (2013) 410�416, http://dx.doi.org/10.1016/j.saa.2013.04.040.
  53. Effect of Aegle marmelos leaf extract on N-methyl N-nitrosourea-induced hepatocarcinogensis in Balb/c mice, Shalini Verma, Theeshan Bahorun, Ranjan Kumar Singh, Okezie I. Aruoma, and Arvind Kumar, Pharmacuitical biology, 2013, DOI: 10.3109/13880209.2013.786100.
  54. Study of hydration of sarcosine, formation of its zwitterion and their different oligomers in aqueous media: A Raman spectroscopic and theoretical study Poornima Sharma, Dheeraj K. Singh, Vineet Gupta, B.P. Asthana, P.C. Mishra, Ranjan K. Singh, Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy xxx (2013) xxx�xxx, http://dx.doi.org/10.1016/j.saa.2013.06.041.
  55. Synthesis, characterisation, mesomorphic investigation and temperature-dependent Raman study of a novel calamitic liquid crystal: methyl 4-(4_-n-alkoxybenzylideneamino)benzoate Rajib Nandi, Hemant Kumar Singh, Sachin Kumar Singh, Bachcha Singh and Ranjan K. Singh, Liquid Crystals, 2013, Vol. 00, No. 00, 1�16, http://dx.doi.org/10.1080/02678292.2013.791380
  56. Syntheses, spectral, X-ray and DFT studies of 5-benzyl-N-phenyl-1,3,4 -thiadiazol-2-amine, 2-(5-phenyl-1,3,4-thiadiazol-2-yl) pyridine and 2 -(5-methyl-1,3,4-thiadiazole-2-ylthio)-5-methyl-1,3,4-thiadiazole obtained by Mn(II) catalyzed reactions; R.K. Dani, M.K. Bharty, S.K. Kushawaha, S. Paswan, Om Prakash, Ranjan K. Singh, N.K. Singh, Journal of Molecular Structure 1054�1055 (2013) 251�261. http://dx.doi.org/10.1016/j.molstruc.2013.09.051.
  57. Raman effect and magnetic properties of doped TbMnO3; A Kumar, P Shahi, S Kumar, K K Shukla, Ranjan Kr Singh, A K Ghosh, A K Nigam and Sandip Chatterjee, J. Phys. D: Appl. Phys. 46 (2013) 125001; doi:10.1088/0022-3727/46/12/125001
  58. Effect of methylation on wavenumber shift of ring breathing mode of pyrimidine in the solution of H2O and D2O by employing Raman difference spectroscopic technique and DFT approach; Shivangi Mishra, Debraj Gangopadhyay, Anurag Singh, J. Popp, Ranjan K. Singh, Vibrational Spectroscopy 65 (2013) 116� 123; http://dx.doi.org/10.1016/j.vibspec.2012.12.001.
  59. Synthesis and mesomorphic investigation of calamitic liquid crystalline system ethyl-[4-(4_-decyloxy)benzoyloxy]-benzoate (4-EDBB): A temperature dependent micro-Raman study and DFT calculations; Rajib Nandi, K. Vikram, Sachin Kumar Singh, Bachcha Singh, Ranjan K. Singh, Vibrational Spectroscopy 69 (2013) 40� 48 http://dx.doi.org/10.1016/j.vibspec.2013.09.002
  60. In vitro monitoring of ring opening of leflunomide: A surface enhanced Raman scattering and DFT based approach Poornima Sharma, Debraj Gangopadhyay, Pushkar Singh, P.C. Mishra, Volker Deckert, Jurgen Popp, Ranjan K. Singh, Chemical Physics Letters 613 (2014) 127�132 http://dx.doi.org/10.1016/j.cplett.2014.08.068.
  61. Fabrication of liquid crystal based sensor for detection of hydrazine vapours; Rajib Nandi, Sachin Kumar Singh, Hemant Kumar Si,ngh, Bachcha Singh Ranjan K. Singha; Chemical Physics Letters 614 (2014) 62�66; http://dx.doi.org/10.1016/j.cplett.2014.09.020
  62. Structural analysis of complexes formed by ethyl 4-phenylthiocarbamoyl piperazine-1-carboxylate with Ni(II), Zn(II) and Cd(II) through spectroscopic and DFT techniques; Om Prakash, Priyanka Gautam, R.K. Dani, Abhisikta Nandi, N.K. Singh, Ranjan K. Singh, Journal of Molecular Structure, 1063 (2014) 184�191; http://dx.doi.org/10.1016/j.molstruc.2014.01.027.
  63. Synthesis, characterization and mesomorphic investigations of ester-substituted aroylhydrazones possessing a lateral hydroxyl group, Sachin Kumar Singh, Hemant Kumar Singh, Rajib Nandi, Vijay Kumar, Nicolae Tarcea, J�rgen Popp, Ranjan K. Singh, Bachcha Singh, Polyhedron 74 (2014) 99�112; http://dx.doi.org/10.1016/j.poly.2014.02.034
  64. Syntheses, spectral and structural characterization of trinuclear and mononuclear Zn(II) complexes of N0-benzoyl hydrazine carboperthioate and 5-phenyl-1,3,4-oxadiazole-2-thione: An approach to DFT calculation, antibacterial and thermal studies, R.K. Dani, M.K. Bharty, S.K. Kushawaha, Om Prakash, V.K. Sharma, R.N. Kharwar, Ranjan K. Singh, N.K. Singh, Polyhedron 81 (2014) 261�272; http://dx.doi.org/10.1016/j.poly.2014.06.022.
  65. Investigations on structural and optical properties of ZnO and ZnO:Co nanoparticles under dense electronic excitations, Shiv Kumar, Kandasami Asokan, Ranjan Kumar Singh, Sandip Chatterjee, Dinakar Kanjilal and Anup Kumar Ghosh; RSC Adv., 2014, 4, 62123, DOI: 10.1039/c4ra09937k.
  66. Vibrational and quantum chemical investigation of cyclization of thiosemicarbazide group in 1-benzoyl-4-phenyl-3-thiosemicarbazide, Priyanka Gautam, Om Prakash, R.K. Dani, N.K. Singh, Ranjan K. Singh, Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy 132 (2014) 278�287; http://dx.doi.org/10.1016/j.saa.2014.03.095.
  67. Mesomorphic, micro-Raman and DFT studies of new calamitic liquid crystals; methyl 4-[4-(4-alkoxy benzoyloxy)benzylideneamino]benzoates Rajib Nandi, Hemant Kumar Singh, Sachin Kumar Singh, Bachcha Singh, Ranjan K. Singh; Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy 128 (2014) 248�256; http://dx.doi.org/10.1016/j.saa.2014.02.112.
  68. Microwave-assisted synthesis and mesomorphic investigations of p-substituted aroylhydrazones and their nickel(II) and copper(II) complexes, Sachin Kumar Singh, Vijay Kumar, Rajib Nandi, Hemant Kumar Singh, Ranjan K. Singh and Bachcha Singh; Liquid Crystals, 2014, http://dx.doi.org/10.1080/02678292.2014.978827.
  69. Synthesis and Raman signature for the formation of CdO/MnO2 (core/shell) nanostructures, Sumeet Kumar, Animesh K. Ojha, Ranjan K. Singh, Journal of Raman Spectroscopy, 45(9) (2014), 717�722
  70. Raman spectroscopic approach to monitor the in vitro cyclization ofcreatine ? creatinine, Debraj Gangopadhyaya, Poornima Sharma, Sachin Kumar Singh, Pushkar Singh, Nicolae Tarcea, Volker Deckert, J�rgen Popp, Ranjan K. Singh; Chemical Physics Letters 618 (2015) 225�230; http://dx.doi.org/10.1016/j.cplett.2014.11.021.
  71. Surface enhanced Raman scattering investigation of two novel piperazine carbodithioic acids adsorbed on Ag and ZnO nanoparticles Om Prakash, Priyanka Gautam, Shiv Kumar, Pushkar Singh, R. K. Dani, M. K. Bharty, N. K. Singh, A. K. Ghosh, V. Deckert and Ranjan K. Singh, RSC Adv., 2015, 5, 5571 DOI: 10.1039/c4ra12928h.
  72. Microwave-assisted synthesis and mesomorphic investigations of p-substituted aroylhydrazones and their nickel(II) and copper(II) complexes, Sachin Kumar Singh, Vijay Kumar, Rajib Nandi, Hemant Kumar Singh, Ranjan K. Singh and Bachcha Singh, Liquid Crystals (2015), 42(2), 222-232.
  73. Probing the orientations of coordination complex molecules onto thesurface of ZnO nanoparticles by means of surface enhanced Raman scattering, UV�vis and DFT methods, Om Prakash, Priyanka Gautam, Ranjan K. Singh, Appl Surface Science, 349 (2015) 657-664.
  74. Temperature dependent Raman and DFT study of creatine, Debraj Gangopadhyay, Poornima Sharma and Ranjan K. Singh, Spectrochimica Acta Part A 150 (2015) 9�14.
  75. Synthesis, spectral characterization, thermal behaviour, antibacterial activity and DFT calculation on N0-[bis(methylsulfanyl)methylene]-2-hydroxybenzohydrazide and N0-(4-methoxy benzoyl)-hydrazinecarbodithioic acid ethyl ester. M.K. Bharty, R.K. Dani, S.K. Kushawaha, Om Prakash, Ranjan K. Singh, V.K. Sharma, R.N. Kharwar, N.K. Singh. Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy 145 (2015) 98�109.
  76. Tuning the thermotropic properties of liquid crystalline p-substituted aroylhydrazones, Hemant Kumar Singh, Sachin Kumar Singh, Rajib Nandi, Madan Kumar Singh, Vijay Kumar, Ranjan K. Singh, D. S. Shankar Rao, S. Krishna Prasad and Bachcha Singh, RSC Adv., 2015,5, 44274-44281.
  77. Syntheses, structural and thermal studies on Zn(II) complexes of 5-aryl-1,3,4-oxadiazole-2-thione and dithiocarbamates: Antibacterial activity and DFT calculations, M.K. Bharty, R.K. Dani, P. Nath, A. Bharti, N.K. Singh, Om Prakash, Ranjan K. Singh, R.J. Butcher, Polyhedron 98 (2015), 84�95.
  78. Multi-layered graphene quantum dots derived photodegradation mechanism of methylene blue, Sima Umrao, Poornima Sharma, Anushka Bansal, Ranjna Sinha, Ranjan K. Singh and Anchal Srivastava, RSC Adv., 2015, 5, 51790.
  79. Ni(II) and Co(III) complexes of 5- methyl-1,3,4-thiadiazole-2-thiol: syntheses, spectral, structural, thermal analysis, and DFT calculation, R.K. Dani, M.K. Bharty, Om Prakash, Ranjan K. Singh, Billa Prashanth, Sanjay Singh & N.K. Singh, Journal of Coordination Chemistry 68(15)(2015) 2666-2681.
  80. Liquid crystal based sensor system for the real time detection of mercuric ions in water using amphiphilic dithiocarbamate, Sachin Kumar Singh, Rajib Nandi, Kirtika Mishra, Hemant Kumar Singh, Ranjan K. Singh and Bachcha Singh, Sensor and Actuators B: Chemical 226 (2016) 381-387.
  81. Modulation of hepatocarcinogenesis in N-methyl-N-nitrosourea treated Balb/c mice by mushroom extracts Ramsaha S, Neergheen-Bhujun VS, Verma S, Kumar A, Bharty RK, Chaudhary AK, Sharma P, Singh RK, Huzar Futty Beejan P, Kyung-Sun K, Bahorun T, Food Funct. 2016 Jan;7(1):594-609
  82. A novel Raman spectroscopic approach to identify polymorphism in leflunomide: A combined experimental and theoretical study, Poornima Sharma, Debraj Gangopadhyay, Sima Umrao, Shiv Kumar, A.K. Ghosh, P. C. Mishra and Ranjan K. Singh, Journal of Raman spectroscopy 47 (2016) 468-475.
  83. Dr Hemant Kumar Singh, Dr. Sachin Kumar Singh, Rajib Nandi, D. S. Shankar Rao, Kris Prasad, Ranjan K Singh, B. Singh, Observation of exceptional deVries-like properties in a conventional aroylhydrazone based liquid crystal, RSC Advances Adv., 5(2015) 442746 DOI:10.1039/C6RA10028G
  84. Rajib Nandi, Dr Hemant Kumar Singh,Dr. Sachin Kumar Singh, D. S. Shankar Rao, Kris Prasad, Bachcha Singh, Ranjan K Singh, Investigation of liquid crystalline property of a new calamitic liquid crystalline system methyl 4-(4'-(4''-(decyloxy)benzyloxy) benzylideneamino)benzoate, Liquid Crystals 44(2016)1-9, DOI:10.1080/02678292.2016.1269959
  85. Debraj Gangopadhyay, Poornima Sharma, Rajib Nandi, Moumita Das, Surajit Ghosh, Ranjan K Singh, In vitro concentration dependent detection of creatinine: a surface enhanced Raman scattering and fluorescence study, RSC Advances 6(2016)112562-112567, DOI: 10.1039/C6RA22886K
  86. Ranjana Singh, Sunayana Kashyap, Suveen Kumar, Shiju Abraham, Dr. Tejendra Kumar Gupta, Arvind M Kayastha, Bansi Malhotra, Preeti S. Saxena, Anchal Srivastava, Ranjan K Singh, Excellent storage stability and sensitive detection of neurotoxin quinolinic acid, Biosensors and Bioelectronics 90 (2017) 224-229, DOI: 10.1016/j.bios.2016.11.053
  87. Priyanka Gautam, Om Prakash, R.K. Dani, Manoj Kumar Bharty, N.K. Singh, Ranjan K Singh, Spectra-structure correlation based study of complex molecules of 1-isonicotinoyl-3-thiosemicarbazide with Ni2+, Mn2+ and Fe3+ using Raman, UV�visible and DFT techniques, Journal of Molecular Structure 1127 (2017) 489-497, DOI: 10.1016/j.molstruc.2016.07.095
  88. Rajib Nandi, Sachin Kumar Singh, Hemant Kumar Singh, D. S. Shankar Rao, S. Krishna Prasad, Bachcha Singh, Ranjan K. Singh, Molecular approach to phase transitions in a calamitic ester substituted aroylhydrazone liquid crystal: Molecular approach to phase transitions, Journal of Raman Spectroscopy 47(9):1095-1101, 2016, DOI: 10.1002/jrs.4933
  89. Rajasekhar Yerrasani, M. Karunakar, Ragini Dubey, Angad Kumar Singh, Rajib Nandi, Ranjan K Singh, T.R. Rao, Synthesis, characterization and photophysical studies of rare earth metal complexes with a mesogenic Schiff-base, Journal of Molecular Liquids 216:510-515, 2016, DOI: 10.1016/j.molliq.2016.01.052
  90. Poornima Sharma, Debraj Gangopadhyay, Phool Chand Mishra, Hirdyesh Mishra, Ranjan K Singh, Detection of in Vitro Metabolite Formation of Leflunomide: A Fluorescence Dynamics and Electronic Structure Study, Journal of Medicinal Chemistry 59(2016)3418-3426, DOI: 10.1021/acs.jmedchem.6b00088
  91. Jhoti Somanah, Srishti Ramsaha, Shalini Verma, Ashok Kumar, Poornima Sharma, Ranjan K Singh, Okezie I Aruoma, Emmanuel Bourdon, Theeshan Bahorun, Fermented papaya preparation modulates the progression of N-methyl-N-nitrosourea induced hepatocellular carcinoma in Balb/c mice, Life sciences, 151 (2016) 330-338 , DOI:10.1016/j.lfs.2016.03.026
  92. Om Prakash, Shiv Kumar, Pushkar Singh, Volker Deckert, Sandip Chatterjee, A.K. Ghosh, Ranjan K Singh, Surface-enhanced Raman scattering characteristics of CuO : Mn/Ag heterojunction probed by methyl orange: effect of Mn 2+ doping, Journal of Raman Spectroscopy, 47 (2016) 813-818 , DOI: 10.1002/jrs.4904
  93. Ambareesh Kumas Singh, Nazia Tarannum, Ranjan K Singh, Meenakshi Singh, Mesalmine targeted water-compatible molecularly imprinted polymer-silver nanoparticles with surface-enhanced raman spectroscopic (SERS) and voltammetric detection, Sensor Letters 14(1) (2016) 76-83 , DOI: 10.1166/sl.2015.3576
  94. Anurag Singh, Debraj Gangopadhyay, Rajib Nandi, Poornima Sharma, Ranjan K Singh, Raman signatures of strong and weak hydrogen bonds in binary mixtures of phenol with acetonitrile, benzene and orthodichlorobenzene, Journal of Raman Spectroscopy, 47 (2016) 712-719 , DOI: 10.1002/jrs.4880
  95. Debraj Gangopadhyay, Poornima Sharma, Dr. Sachin Kumar Singh, Pushkar Singh, Volker Deckert, J�rgen Popp, Ranjan K Singh, Surface enhanced Raman scattering based reaction monitoring of: In vitro decyclization of creatinine ? creatine, RSC Advances 6(64) (2016) 58943-58949, DOI: 10.1039/C6RA03674K
  96. Ambareesh K. Singh, Nazia Tarannum, Ranjan K Singh, Meenakshi Singh, Mesalmine Targeted Water-Compatible Molecularly Imprinted Polymer-Silver Nanoparticles with Surface-Enhanced Raman Spectroscopic (SERS) and Voltammetric Detection, Sensor Letters, 14 (2016) 76-83, DOI: 10.1166/sl.2016.3576.
  97. Spectroscopic and structural study of the newly synthesized heteroligand complex of copper with creatinine and urea, Debraj Gangopadhyay, Sachin Kumar Singh, Poornima Sharma, Hirdyesh Mishra, V.K. Unnikrishnan, Bachcha Singh and Ranjan K. Singh, Spectrochimica Acta Part A, 154 (2015) 200-206, DOI: 10.1016/j.saa.2015.10.028
  98. Ranjana Singh, Vijay K Mishra, Dr Hemant Kumar Singh, Gunjan Sharma, Biplob Koch, Bachcha Singh and Ranjan K Singh, Mg co-ordination with potential carcinogenic molecule acrylamide: Spectroscopic, computational and cytotoxicity studies, Journal of Molecular Structure, 1155 (2017) 330-336, DOI: 10.1016/j.molstruc.2017.10.095
  99. Surajit Ghosh, Prayas Chandra Patel, Debraj Gangopadhyay, Poornima Sharma, Ranjan K Singh, P. C. Srivastava, Structural and Magnetic Studies of Thermally Treated NiFe2O4 Nanoparticles, Metallurgical and Materials Transactions A, 48 (2017) 6135-6141 , DOI: 10.1007/s11661-017-4344-y
  100. Kunwar Vikram, Ranjan K Singh, Satyendra Nath Gupta, A new low temperature solid modification in 1-isothiocyanato-4-( trans 4-propylcyclohexyl)benzene (3CHBT) probed by Raman spectroscopy and quantum chemical calculation, Spectrochimica Acta Part A Molecular and Biomolecular Spectroscopy 190 (2017) 188-196, DOI: 10.1016/j.saa.2017.09.015
  101. Zeba Firdaus, Pradyot Prakash, Ranjana Singh, Nabarun Nandy, Monika Bansal, Ranjan K Singh, Anchal Srivastava, Jagat K. Roy, Brahmeshwar Mishra, Rakesh K. Singh, Curcumin Quantum Dots Mediated Degradation of Bacterial Biofilms, Frontiers in Microbiology 8, 2017, DOI: 10.3389/fmicb.2017.01517
  102. Ranjana Singh, Sunil Kumar Rai, Manish Kumar Tiwari, Anurag Mishra, Ashish K. Tewari, Phool Chand Mishra, Ranjan K Singh, An excellent stable fluorescent probe: Selective and sensitive detection of trace amounts of Hg +2 ions in natural source of water, Chemical Physics Letters 676(2017) 39-45, DOI: 10.1016/j.cplett.2017.03.046.
  103. Poornima Sharma, Rajib Nandi, Debraj Gangopadhyay, Anurag Singh, Ranjan K Singh, Temperature dependent polymorphism of pyrazinamide: An in situ Raman and DFT study, Spectrochim Acta A: Mol Biomol Spectrosc. 190 (2018) 177-180. doi: 10.1016/ j.saa.2017.09.016. Epub 2017 Sep 13.
  104. Ranjana Singh Sunayana Kashyap Vimal Singh Arvind M Kayastha Hirdyesh Mishra Preeti S. Saxena Anchal Srivastava Ranjan K Singh, QPRTase modified N-doped carbon quantum dots: A fluorescent bioprobe for selective detection of neurotoxin quinolinic acid in human serum, Biosensors & Bioelectronics 101 (2018) 103-109. DOI: 10.1016/j.bios.2017.10.017
  105. Deepa Singh, Vandana Gupta, Ranjan K Singh, K. K. Bamzai, Effect of neodymium doping on structural, electrical and magnetic properties of multiferroic GdMn2O5, Journal of Materials Science Materials in Electronics 28(2017) 8414-8422. DOI:10.1007/s10854-017-6559-5
  106. Rashmi Gupta, Deepa Singh, Ranjan K Singh and K. K. Bamzai, Effect of Ni addition on PNZT tungsten bronze structure. J. Electroceramics 40 (2018) 235-246. DOI: 10.1007/s10832-018-0125-2
  107. Debraj Gangopadhyay, Poornima Sharma, Keshav singh, Moumita Das , Poonam Tandon, Ranjan K Singh, Monitoring the In Vitro Thiazolidine Ring Formation of Antioxidant Drug N-Acetyl-L-Cysteine at Basic pH and Detection of Reaction Intermediates: A Raman Spectroscopic and Ab Initio Study, J. Phys. Chem. B, 2018, 122 (45), pp 10306�10314, DOI: 10.1021/acs.jpcb.8b08512.
  108. Ranjana Singh, Manish Kumar Tiwari, Debraj Gangopadhyay, Phool Chand Mishra, Hirdyesh Mishra, Anchal Srivastava, , Ranjan K Singh, Detection and monitoring of in vitro formation of salicylic acid from aspirin using fluorescence spectroscopic technique and DFT calculations. J Photochem Photobiol B. 2018 Dec;189:292-297. DOI: 10.1016/j.jphotobiol.2018.11.004
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