Syntheses, crystal structures and luminescent properties of three new halogencuprate(I) complexes with 4-(trimethylammonio)phenyldisulphide

Reactions of CuX (X=I, Br) with TabHPF6 (Tab=4-(trimethylammonio)benzenethiolate) under the existence of Et3N or Et4NI in open air gave rise to three novel halogencuprate(I) complexes with 4-(trimethylammonio)phenyldisulphide (Tab–Tab): [Tab–Tab][CuX3] (1: X=I; 2: X=Br) and {[Tab–Tab][Cu2I4]}n (3). Compounds 1–3 are characterized by elemental analysis, IR spectra and X-ray crystallography. It was found that the Tab–Tab dication in 1–3 serves as a counterion to maintain the electrical neutrality of 1–3. The dianions of 1 and 2 have planar triangular geometry with each halide atom being bound to the central trigonally coordinated copper atom. The dianion structure of 3 has a unique one-dimensional wavy chain composed of butterfly shaped [Cu2I3] units linked by μ-I bridges. The luminescence properties of 1–3 along with [Tab–Tab]I2 have also been investigated.