Synthesis, growth, structural, thermal, linear and nonlinear optical properties of a new organic crystal: Dimethylammonium picrate

Abstract

Single crystal of dimethylammonium picrate (DMAP) was successfully grown for the first time by the slow evaporation method with dimensions 25×15×10 mm 3 . 1 H NMR was recorded to elucidate the molecular structure. The cell parameters were determined from single crystal X-ray diffraction studies. The crystal has eight developed facets with major ones (0 0 1) and (0 0 −1). The structural perfection of the grown crystals has been analyzed by high-resolution X-ray diffraction (HRXRD) rocking curve measurements. Fourier transform infrared (FTIR) spectral studies have been performed to identify the functional groups. Thermo gravimetric analysis (TGA) and differential thermal analysis (DTA) were used to study its thermal properties. Powder test with Nd:YAG laser radiation shows second harmonic generation. The proton donor (–OH) group and proton acceptor amine (–NH) group in the DMAP structure provide infrastructure to introduce the charge asymmetry. The optical transmittance window and the lower cutoff wavelength of the DMAP have been identified by UV–vis–NIR studies. The laser induced surface damage threshold for the grown crystal was measured using Nd:YAG laser. The dielectric properties of DMAP from 323 to 373 K were investigated by the impedance analysis. The microhardness test was carried out and the load dependent hardness was measured.