Abstract
Single crystals of tetrakis(thiourea)zinc(II) picrate (TTZP) have been grown by slow evaporation of a mixed solvent system water–acetone containing thiourea, zinc chloride and picric acid. Crystal composition determined by single crystal X-ray diffraction analysis reveals that it belongs to the triclinic system with space group P1̄ and the cell parameters are, a=6.8333(5)Å, b=12.6011(1)Å, c=18.3423(14)Å, α=90.02°, β=99.977°, γ=100.71°, V=1527.5(2)Å3 and Z=2. The zinc metal is coordinated by four thiourea groups with Zn–S–C bond angles ranging from 108.65° to 113.55° and Zn–S bond lengths lying in the range 2.320 to 2.327Å in a distorted tetragonal geometry. The crystal contains Zn(tu)42+ cations and stacks of picrate ions. Higher transmittance in the visible region is observed with a lower optical cut-off at ∼290nm. The diffuse reflectance spectroscopy (DRS) was employed to estimate the band gap energy. The vibrational patterns in FT-IR are used for identifying the material and the thermal analysis by TG/DTG indicates the stability.
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