Synthesis and Crystal Structure of a Copper(II) Complex with a Tab-Tab Disulfide Ligand (Tab-Tab)[CuBr_4](Tab=Trimethylammoniumphenyl-4-thiolate)

1 INTRODUCTION In the past decades, metal disulphides have recei- ved much attention due to their diversity struc- tures1~4] and applications as potential ligands for metal ions in biological system5]. Metal disulfide compounds are usually prepared from the direct reactions of metal ions with organic disulphide1~5], while some others are isolated from the reactions of metal salts and thiolates with the presence of certain oxidizing agents (e.g., O2, H2O2, etc.)6, 7]. A large number o…

Synthesis and Crystal Structure of a Copper(II) Complex with a Tab-Tab Disulfide Ligand (Tab-Tab)[CuBr_4](Tab=Trimethylammoniumphenyl-4-thiolate)

Reaction of CuBr2 with TabHPF6/Et3N in methanol followed by dissolving the resulting precipitate in hydrobromic acid yielded purple blocks of the title complex Tab-Tab]CuBr4] 1 (C18H26CuBr4N2S2). 1 crystallizes in the monoclinic system, space group P21/n with a = 9.686(3), b = 19.257(5), c = 13.399(4) ,  = 93.610(9)o, V = 2494.2(13) 3, Z = 4, Dc = 1.911 g/cm3, T = 193(2) K, Mr = 717.71, F(000) = 1396, μ = 74.58 cm-1, S = 1.126, R = 0.0748 and wR = 0.1736 for 2921 observed reflections with I > 2σ(I). The structure of 1 contains a discrete CuBr4]2- dianion and a Tab-Tab]2+ dication. In the dianion, the Cu atom is coordinated to four Br atoms forming a distorted tetrahedral coordination geometry. The bromides of the dianion interact with the H atoms of the phenyl and methyl groups of the dications to form a 1D hydrogen-bonded chain.