Study of the synthesis, structural, vibrational and optical properties of the new compound: (C8H14N2)2TeCl6. Cl2.

Tellurium (VI) complex with 4-ethylaminomethyl pyridine was synthesized by slow evaporation from aqueous solutions giving birth to a novel compound (C₈H₁₄N₂)₂TeCl₆.Cl₂, whose structure was determined by X-ray diffraction at room temperature. The centrosymmetric compound crystallizes in the triclinic system of space group P 1 ¯ with the parameters that follow: a = 7.2855(14)Å, b = 9.0652(17)Å, c = 10.4408(19)Å, α = 89.750(6)°, β = 83.772 (6)°, γ = 79.304 (7)° and Z = 2. The crystal structure is composed of the (TeCl₆)²⁻ anion and two 4-ethylaminomethyl pyridinium (C₈H₁₄N₂)⁺ cations. Organic and inorganic parts are connected by hydrogen bonding contact (N–H...Cl) length varying from 3.030 to 3.352 Å. The infrared spectra (FTIR) were recorded between 4000 and 400 cm⁻¹, substantiating the existence of vibrational modes that correspond to the organic and inorganic groups. The Raman spectra were recorded in the external region at the anionic substance vibration 50–500 cm⁻¹. The optical absorption spectrum reveals a broad and strong luminescence band located at 4.9 eV (253 nm), which is accredited to the exaction emission. The parameters of the optimized structural and vibrational frequencies (the experimental and theoretical vibrational frequencies) were assigned. The Hirshfeld surface analysis was used to investigate the various intermolecular interactions of the two independent cations and the six chloride atoms. [ABSTRACT FROM AUTHOR]