Gold complexes maleonitriledithiolates

The ligand iso-maleonitriledithiolate was synthesized as the potassium salt, according to the procedure of Gomper and Topel [9]. Its gold complex was obtained by the reaction of potassium tetrachloroaurate with K2(i-mnt)2 in die presence of tetra-n-butylammonium bromide [10]. 

Homoleptic gold(III) derivatives with dithiolate, ligands of the type [Au(S-S)2] are well known and are usually prepared from [AuC14] with the dithiol some examples are with 1,2-benzene dithiolate, maleonitriledithiolate, dmit, and so on, [164, 336]. Similar complexes have been reported for bidentate sulfur ligands such as dithiocarbamates, dithiophosphates, and so on, [41]. Other derivatives as the trinuclear species [Au(C6F5)(S2C6H4)]3 [337] or the complex with one nido and one closo-carborane dithiolate are known [338]. Figure 1.72 collects some of these complexes. 

The crystallographically characterized, neutral, and air-sensitive complex of gold(II), [Au S2C2(CN)2 2] (13), which contains the maleonitriledithiolate ligand, has square-planar geometry. An air-stable octahedral Au complex [A11L2] (Bp4)2 (L = 1,4, 7-trithiacyclononane) (14) is obtained from the reaction of K[AuCLi] with L. ... 

A dinuclear selenide complex anion [Au2(M-Se)2(Se4)2] is the product of the reaction" between [AuCN] and Na2 Ses. Square-planar gold(IIl) complexes are readily formed by a variety of bidentate sulfur-donor ligands such as toluene-1,2-dithiolate, maleonitriledithiolate, and dithiocarbamate. On oxidation with CI2 or Br2, [ Au(S2CNR)2 2] forms Au -Au complexes, which may be oxidized further to an Au complex. 

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