A semi-organic nonlinear optical material dichloro(4-hydroxy-L-proline)cadmium(II) (DCHPC) of molecular formula [CdCl2(C5H9NO3)] has been successfully synthesized and good optical quality single crystals were grown by slow solvent evaporation solution growth technique at room temperature. The presence of the elements in the grown crystal has been confirmed by Energy dispersive spectrometry (EDS) and CHN analyses. The H-1 and C-13 NMR spectra were recorded to confirm the molecular structure of DCHPC crystal. The single crystal XRD analysis indicated that the crystal belongs to monoclinic structure with lattice parameters a = 8.154(2) angstrom, b = 7.223(4) angstrom, c = 7.697(3) angstrom and space group P2(1). The optical transmission window of the DCHPC has been identified by UV-vis-NIR studies. The presence of various functional groups in the crystal was confirmed by FT-IR spectral analysis. The second harmonic generation (SHG) efficiency was estimated using the modified Kurtz-Perry powder test and was found to be 0.5 times that of KDP. The fluorescence emission spectrum of the title crystal shows blue emission. The TG/DTA study was carried out to determine the thermal stability of the grown crystal. Dielectric property was studied at various frequencies. (C) 2013 Elsevier GmbH. All rights reserved.

Single crystals of a new organic material, 4-hydroxy-l-proline-l-tartaric acid (HPTA) adduct, were grown by slow evaporation of an aqueous solution containing equimolar concentrations of 4-hydroxy-l-proline and l-tartaric acid at room temperature. Formation of new crystal has been confirmed by single crystal X-ray diffraction and NMR spectroscopic techniques. The single crystal XRD analysis shows that a molecule of 4-hydroxy-l-proline and a molecule of free l-tartaric acid both of which are interlinked to each other by two types of H-bonding interactions, namely O(6)–H(6)⋯O(2) and N(1)–H(1B)⋯O(10). The title compound (HPTA) crystallizes in monoclinic crystal system with non-centrosymmetric space group P21. The suitability of the crystal for optical applications was studied by UV–Vis–NIR spectroscopy. Fourier transform infrared (FT-IR) spectral analysis was used to confirm the presence of various functional groups in the grown crystals. The thermal stability of the compound was investigated by thermogravimetric and differential thermal analyses. The dielectric constant and dielectric loss of the crystal were studied as a function of frequency and temperature. The fluorescence spectral analysis of the title crystal shows an indigo emission. The second order nonlinear optical (NLO) property of the crystal was confirmed by the modified Kurtz–Perry powder second harmonic generation (SHG) test.

A new charge transfer molecular complex salt of picric acid with m-toluidine was synthesized and the structure confirmed by single crystal X-ray diffraction (XRD) and NMR spectral analyses. Single crystals of m-toluidinium picrate have been grown by slow solvent evaporation solution growth technique using ethanol as the solvent at ambient temperature. The single crystal XRD analysis of MTP salt confirms the formation of 1:1 charge transfer salt in which the constituent ions are held together by strong intermolecular N-H-O type hydrogen bonds. The title compound crystallizes in monoclinic crystal system with centrosymmetric space group P21/c. The optical properties were studied by the UV-Vis-NIR transmittance and the fluorescence emission studies. Fourier transform infrared (FT IR) spectral analysis was used to confirm the presence of various functional groups in the grown crystal. Thermal stability of the grown MTP crystal was established using the thermo gravimetric and differential thermal analysis.