Bridged arsine complexes

Dimeric halogen bridged arsine complexes of Pt (II) are readily oxidised to Pt (IV) compounds (75). 

Mnltinnclear Re hydrides, in particnlar CO/phosphine complexes, with the hydride bridging two or three metals and componnds with H atoms bridging Re and other metals, for example, obtained from the reactions of Re polyhydrides with metal salts, have been reported. The coordination chemistry of hydrido/phosphine complexes has been extended, in a nnmber of cases, to related phosphite, phosphonite, or arsine complexes. ... 

Platinum(II) salts behave similarly, although the range of cycloplatinated compounds is less extensive. Thus, chloride-bridged diplatinum complexes may be prepared with metallated N ligands such as azobenzene, 2-phenylpyridine, or 8-methylquinol-line . Tertiary phosphine and arsine complexes also may undergo metallation ... 

The arsine complex (Ph3As)AuOSiMea was similarly prepared. The tris-(phosphine)-copper and -silver complexes and the gold complexes are monomeric, with two-co-ordinate metal the mono- and bis-(phosphine)-copper and -silver siloxanes are oligomers (38) and (39), with bridging... 

Complexity in the manganese and rhenium pentarbonyl halides substitution arises from the fact that these decompose in inert solvents to form the halogen-bridged dimers [M(CO)4X]2. Both monomers and dimers react with phosphines, arsines, pyridine, aniline etc. to give the disubstituted compounds M(CO)3XL2. Thus three final products or any mixture of them may be obtained, depending upon the precise reaction conditions... 

The diarsine and arsine/phosphine analogues of dppm have been used to prepare bridged diplatinum(I) complexes, in both cases with terminal chloro ligands.116,117 Both complexes react with carbon monoxide to produce carbonyl-bridged species. The mixed thio/phosphine ligand Ph2PCH2SMe (PS) also forms a diplatinum(I) complex by conproportionation of its dichloroplat-inum(II) complex with [Pt(dba)2].118 This dimer reacts with carbon monoxide to produce an unsupported dimer [PtCl(PS)(CO)]2 with the thioether arm of the Ph2PCH2SMe unbound. 

---