Single crystal of a new organic-inorganic hybrid material [C 6 H 10 (NH 3 ) 2 ] 3 CuBr 4 .3Br was synthesized by the slow evaporation method at room temperature and characterized by X-ray diffraction, FTIR, Raman spectroscopy, UV-Vis, dielectric measurements, and Hirschfield surface analysis. The title compound crystallizes in trigonal system P3.The crystal packing is governed by the N-H…Br and non-classical C-H…Br hydrogen-bonding interactions between the 1, 2diamoniumcyclohexane cations, the tetrahedral [CuBr 4 ] 3− anions, and the isolated ion Br − . Theoretical calculations were performed using density functional theory (DFT) for studying the molecular structure, vibrational spectra, and optical properties of the investigated molecule in the ground state. The optimized geometrical parameters obtained by DFT calculations are in good agreement with single crystal XRD data. The optical properties were investigated by optical absorption and show two bands at 260 and 305 nm.
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