Crystal structure, spectral, thermal and dielectric studies of a new zinc benzoate single crystal

Abstract

Single crystals of zinc benzoate with a novel structure were grown in gel media. Sodium metasilicate of gel density 1.04g/cc at pH 6 was employed to yield transparent single crystals. The crystal structure of the compound was ascertained by single crystal X-ray diffractometry. It was noted that the crystal belongs to monoclinic system with space group P21/c with unit cell parameters a=10.669(1)Å, b=12.995(5)Å, c=19.119(3)Å, and β=94.926(3)°. The crystal was seen to possess a linear polymeric structure along b-axis; with no presence of coordinated or lattice water. CHN analysis established the stoichiometric composition of the crystal. The existence of functional groups present in the single crystal system was confirmed by FT-IR studies. The thermal characteristic of the sample was analysed by TGA–DTA techniques, and the sample was found to be thermally stable up to 280°C. The kinetic and thermodynamic parameters were also determined. UV–Vis spectroscopy corroborated the transparency of the crystal and revealed the optical band gap to be 4eV. Dielectric studies showed decrease in the dielectric constant of the sample with increase in frequency.