Coordination Chemistry of Dimethylgold Halides with Bidentate Phosphorus and Arsenic Ligands – Revisited
✍ Scribed by Paul, Martin ;Schmidbaur, Hubert
- Publisher
- Wiley (John Wiley & Sons)
- Year
- 1996
- Tongue
- English
- Weight
- 710 KB
- Volume
- 129
- Category
- Article
- ISSN
- 0009-2940
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✦ Synopsis
Dimethylgold halides, complexes of / Bidentate phosphorus ligands / Bidentate arsenic ligands Dimethylgold(II1) chloride and bromide, (MezAuX)2, react with bis(diphenylphosphany1)methane (dppm, molar ratio 1 :2) to give the P-monohapto complexes cis-Me,AuX(dppm) (la, b) in quantitative yields. The products are readily oxidized by air to yield the P-hapto P'-monoxides 2a, b. Treatment of la, b with AgN03 affords an ionic nitrate [MezAu(dppm)lz [NO,] (lc), which contains a dinuclear cation. A mixed bromidehitrate (from l b and half the equivalent amount of AgN03) is thermally unstable and undergoes elimination of ethane to give an ionic tetranuclear gold(1) complex [ (dppm),Au,Br2l2+ [NO;]2 (3b). -Treatment of (Me2AuC1), with CH2(AsPh& (dpam, molar ratio 1:2) gives cis-Me2-AuCl(dpam) (ld), the arsenic analog of l a , which is not sensitive to oxygen. -The reaction of bis(diphenylphosphany1)amine (dppa) yields 1 : 1 P-monohapto adducts Me2. AuX(dppa), which are in equilibrium with ionic chelated systems Me,Au(dppa)+ X-(le, f). Complex l e is readily oxidized by air to the P-hapto PI-monoxide cis complex 2e. Treatment of l e with AgN03 gives the ionic nitrate Me2. Au(dppa)+ NO, (lg). -All compounds were identified by standard analytical and spectroscopic techniques. The crystal structures of Za, 3b, Id, and 2e were determined by singlecrystal X-ray diffraction studies.