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Abstraet--Tris(2-cyanoethyl)phosphine (CEP) acts as a phosphorus-donor ligand forming strong metal-phosphorus bonds in several metal complexes. It forms monomeric complexes with AuCl and AuBr, whereas an ionic complex [{(CEP)2Au} + {Au(CN)2} -] (I) was formed with AuCN, presumably as a result of ligand scrambling in solution. The X-ray structure of I revealed mutually perpendicular [(CEP)Au(CEP)] + and [(CN)Au(CN)]- ions, with an Au--Au separation of 3.279(2)/~. No inter- or intramolecular metal coordination of C=N groups was observed. There are two three-coordinated gold atoms per asymmetric unit, with a packing pattern based upon alternating [(CEP)2Au] + and [Au(CN)2]- ions. The presence of C~N groups in gold complexes of trialkylphosphines appears to be conducive towards ligand scrambling reactions forming ionic complexes, as compared to the monomeric linear species in the case of chloro or bromo complexes. Copyright/ 1996 Elsevier Science Ltd |
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