Crystal and molecular structure, and spectroscopic characterization of tetrakis(2-amino-1,3,4-thiadiazolium) hexadecabromotetra-antimonate(III)

The compound [HL]4[Sb4Br16](L = 2-amino-1,3,4-thiadiazole) was prepared and characterized by means of X-ray, i.r., and Raman measurements. Crystals are triclinic, space group P, with cell dimensions a= 10.995(2), b= 11.950(2), c= 9.830(2)Å, α= 112.92(2), β= 96.23(2), γ= 73.78(1)° and Z= 1. The structure was solved by the heavy-atom method and refined by least-squares calculations to a final R value of 0.034 for 2 804 independent reflections. The crystal consists of a highly condensed [Sb4Br16]4– anion and four HL+ cations. The anion has eight bromine atoms involved in hydrogen bonds with N-bonded H atoms. The metal atoms have distorted octahedral geometry.

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