Abstract
A new organic-inorganic phase compound (C5H6N)2TeCl6, was synthesized and its structure was determined at room temperature in the monoclinic system (C2/m space group) with the following lattice parameters: a = 12.9000(18) Å, b = 8.4777(12)Å, c = 8.0127(11)Å and β = 96.860(2)°. The final refinement cycle of all isotropic and anisotropic thermal parameters led to R = 0.026 and wR = 0.03. The anion and cation chains are linked by N-H…Cl hydrogen bonds.The infrared spectra were recorded in the 4000–400 cm−1 frequency region. The Raman spectra were recorded in the external region of the anionic sublattice vibration 50–1500 cm−1. The optical band gap was calculated from the UV-Vis absorbance spectra using classical Tauc relation which was found to be 2.48 eV. Several thermal analysis techniques such as thermogravimetric analysis, differential scanning calorimetric analysis and evolved gas analysis were used. We observe that the decomposition of (C5H6N)2TeCl6 occurs between 473 and 573 K with the formation of pyridine, HCl, Cl2 and N2 as volatiles.
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