Dinuclear anionic gold

A series of dinuclear anionic gold or mixed gold(I)/gold(III) compounds have been reported recently, all of them containing C6F5 as aryl group, probably due to the stabilizing... 

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. 

As can be seen in Scheme 11, various procedures have been established for the further derivatization of dinuclear gold(II) ylide complexes by ligand substitution. Halide ligands can be substituted by neutral donor ligands such as tetrahydrothiophene or pyridine (giving the corresponding cationic complexes)249, or with other anionic ligands (such as... 

Another type of potential pincer ligand with an anionic central moiety has been proposed by Poethig and Strassner. The ligands have the structure displayed in 12 and feature an anionic triazinone central moiety. Such moiety is actually a very weak electron donor hence, these ligands have not been employed up to now to prepare pincer complexes, but rather dinuclear complexes of silver(I) and gold(I), in which the central triazinone moiety remains uncoordinated. The resulting complexes are emissive in the sofid state and are neutral, which facifitates their dispersion into, e.g., polymer films for photophysical appHcations. 

Other cases of transition-metal ion binding to the imidazole ring N9 atom of the purine ligand have been reported in the monomer [TiCl(cp)2(pur-KA )] (cp is the cyclopentadienyl anion) with a purinate monoanion" and a series of neutral dinuclear and mononuclear gold(I) complexes with phosphine and purin-9-ate synthesized under basic conditions. There are reported examples of Mn(II) binding to N donor sites of nueleobases in biopolymeric systems, but coordinative Mn-N linkages involving isolated nueleobases, as seen in... 

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