Optical, thermal, mechanical and dielectric properties of hexakis(urea)cobalt(II) sulfate monohydrate: A semiorganic crystal

Single crystals of hexakis(urea)cobalt(II) sulfate monohydrate have been grown by slow evaporation solution growth technique at room temperature. The single crystal X-ray diffraction study reveals that the crystal belongs to orthorhombic system with noncentrosymmetric space group Pca2(1) and the cell parameters are, a=15.0549(6) angstrom, b=7.2105(3) angstrom, c=20.0284(9) angstrom, V=2174.15 (16) angstrom(3) and Z=4. The functional groups of the metal-urea complex were confirmed by Fourier transform infrared spectroscopy. The powder X-ray diffraction study reveals the crystallinity of the as-grown material. The band-gap energy of the specimen is estimated by Kubelka-Munk algorithm. The dielectric results indicate an increase in dielectric and conductivity parameters with an increase of temperature at all frequencies. The crystal is further characterized by mechanical and thermal analysis. Crown Copyright (C) 2012 Published by Elsevier B.V. All rights reserved.