Synthesis, crystal growth, spectral, optical, thermal and dielectric studies of dichloro(4-hydroxy-l-proline)cadmium(II) single crystals

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 1H and 13C 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) Å, b = 7.223(4) Å, c = 7.697(3) Å and space group P21. 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.