title: Vibrational spectroscopic studies of an organic non-linear optical crystal 8-hydroxyquinolinium picrate.
abstract: 8-hydroxyquinolinium picrate (8-HQP) was synthesized by the addition of equimolar quantities of 8-hydroxyquinoline (8-HQ) and picric acid (PA). Single crystals were grown from N,N dimethyl formamide (DMF) by restricted evaporation method at room temperature. The solubility of 8-HQP was determined in different solvents at various temperatures. The structural characterization of the grown crystals was carried out by X-ray diffraction. Vibrational modes were classified on the basis of group theoretical analysis and the spectral bands were compared with those of parent compounds in order to propose a tentative assignment by recording FT-IR, FT-Raman and polarized Raman spectra in different crystal orientations. The crystal possess lower cut-off at 230 nm and good transparency as confirmed by optical transmittance studies.
authors.affiliation: Department of Physics, Periyar University, Salem 636011, Tamil Nadu, India. vkrishna_kumar@yahoo.com
authors.forename: V
authors.initials: V
authors.lastname: Krishna Kumar
authors.forename: R
authors.initials: R
authors.lastname: Nagalakshmi
mesh_terms: D018360:Crystallography, X-Ray; D006860:Hydrogen Bonding; D008956:Models, Chemical; D017711:Nonlinear Dynamics; D010851:Picrates / Q000138:chemical synthesis / Q000737:chemistry*; D011806:Quinolinium Compounds / Q000138:chemical synthesis / Q000737:chemistry*; D012995:Solubility; D017550:Spectroscopy, Fourier Transform Infrared; D013059:Spectrum Analysis, Raman; D014732:Vibration
chemical_list: C519772:8-hydroxyquinolinium picrate; D010851:Picrates; D011806:Quinolinium Compounds; C005858:picric acid