L. Guru Prasad

Growth and characterization of semi-organic nonlinear optical crystal: Sodium 2,4-dinitrophenolate monohydrate

Sodium 2,4-dinitrophenolate monohydrate salt has been synthesized and the crystals have been grown in aqueous solution by slow evaporation solution growth technique. Grown crystal was confirmed by powder XRD studies. Functional groups presented in the grown crystal were identified and their vibrational properties were studied by recording FTIR spectrum. Thermal stability of the grown crystal was deliberated by recording TGA/DTA. Existence of the ionic form in the crystal was confirmed and the energy gap of the crystal was also calculated by analyzing UV-VIS-NIR spectrum. Second harmonic frequency generation was examined by Kurtz and Perry powder test and it reveals that the relative conversion efficiency was 2.5 times greater than the urea. Theoretical first order hyperpolarizability value was calculated for the optimized structure.

Spectroscopic and physicochemical studies on organic crystal of brucine hydrogen maleate pentahydrate.

Salt of brucine hydrogen maleate pentahydrate was synthesized and grown as a single crystal by slow evaporation solution growth technique. The cell parameters of the grown crystal were calculated from powder XRD. The presence of the functional groups and the nature of the vibrations were identified in vibrational studies. The decomposition character of the title material was studied by recording TGA/DTA. The way of promotion of electron from ground state to higher energy state was premeditated by recording UV-VIS-NIR spectrum also the mechanical behaviour was deliberated in hardness measurement.