The preparation and crystal structure of dichloro(3,5-diamino-1,2,4-dithiazolium)copper(I), Cu(S2C2N3H4)Cl2. An example of a positively-charged electron-donor ligand

Abstract

The compound dichloro( 3,B-diamino-1,2,4-dithiazolium) copper(1) has been prepared and its crystal structure determined as a spiraling Cu-C1-Cu chain of approximately tetrahedral CuI bound to three C1 atoms and a ring nitrogen. SYSTEMS containing the S-S linkage and their interactions with metal ions are of considerable interest because of their close relationship to the interaction of metal ions with cystine in biological systems.1 We have generated this linkage as part of a reaction of dithiobiuret with C u n chloride. This reaction gave a positively charged ring system, (S2C2N3HJ4 and CuI is bound to this ring system via a ring nitrogen; this binding has not been observed previously.This reaction between a 95% ethanol solution of CuC1,--2H20 and an ether solution of dithiobiuret (Hdtb, S2C,N,H,) gives three crystalline products : (1) olive green (the material reported here), (2) yellow (under investigation), and(3) a blue material, the eventual end product in air, most likely CuS0,.5H20.