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  • Title: Vibrational spectroscopic studies of an organic non-linear optical crystal 8-hydroxyquinolinium picrate.
    Author: Krishna Kumar V, Nagalakshmi R.
    Journal: Spectrochim Acta A Mol Biomol Spectrosc; 2007 Apr; 66(4-5):924-34. PubMed ID: 17029942.
    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.
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