Coordination chemistry of gold(II) with amidinate, thiolate and ylide ligands

Group 11 Amidinates and Guanidinates: Potential Precursors for Vapour Deposition

“…This is also typical of previously-reported similar gold compounds. [9] Again, single-crystal X-ray structures of 8-10 also confirm these compounds to be dimers (Tables 5 and 6, Figure 3). …”

“…The Au-N bonds are all very similar, around 2.04 Å, which agrees with known gold guanidinate compounds. [9] The Au-Au separations are similar for all three cases with a slight deviation from a linear geometry at the metal centres. The nitrogen atoms in 9 and 10 show very planar geometries, demonstrating the resonance of the π bond between the chelating nitrogen atoms.…”

“…[8] Gold amidinate complexes have previously been reported, although thermal data were not included. [9] We have thus undertaken the synthesis and ther- (8) was found to be sublimable at 85°C and 20 mTorr, and deposited gold metal under higher temperatures. These metal-depositing thermal reactions were thought to abstract a hydrogen from the guanidinate ligand, which acts as the reducing agent.…”

Reactivity of Mononuclear and Dinuclear Gold(I) Amidinate Complexes with CS2 and CsBr3

“…The Au-P and Au-N bond distances of 2.2297(4) and 2.0331(4) Å, respectively, are typical for a phosphine and amide coordinated to a Au(I) center, We then turned our attention to the reactivity of 1. The reaction of 1 with CS2 produced a color change from colorless to yellow, Equation (3). (3) The 1 H NMR spectrum revealed an asymmetric ligand environment with two different methyl resonances and a new 31 P NMR resonance at 36.6 ppm.…”

“…Hence, gold-nitrogen bonds are uncommon [1] and the reactivity of these bonds is relatively unexplored [2]. With the recent advances in gold amidinate chemistry [3], we sought to develop this reactivity by examining insertion and oxidative chemistry in Au(I) amidinate complexes.…”