Synthesis and structural characterization of polynuclear complexes containing the eight-electron donor bis(diphenylphosphino)methanediide ligand

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Abstract
The compound [AuR2{(Ph2P)2CH}](R = C6H5) reacts with various gold(I) or silver(I) compounds possessing a labile ligand such as tetrahydrothiophene or perchlorate to give [AuR2{(Ph2P)2CH(ML)}]ClO4(ML = AuPPh3, AuCH2PPh3 or AgPPh3). Treatment of these derivatives with [Au(acac)(PPh3)] or [N(PPh3)2][Au(acac)Cl](acac = acetylacetonate) leads to [AuR2{(Ph2P)2C(AuPPh3)(ML)}]ClO4 or [AuR2{(Ph2P)2C(AuPPh3)(AuCl)}], in which the doubly deprotonated bis(diphenylphosphino)methanediide ligand is an eight-electron donor. The compound [AuR2{(Ph2P)2C(AuPPh3)2}]ClO4 can also be obtained by reaction of [AuR2{(Ph2P)2CH2}]ClO4 and [Au(acac)(PPh3)] in 1 : 2 molar ratio. The reaction of [AuR2{(Ph2P)2CH(AuR)}] with [Au(acac)(PPh3)] or [N(PPh3)2][Au(acac)Cl] gives the trinuclear complexes [AuR2{(Ph2P)2C(AuR)(AuPPh3)}] or [N(PPh3)2][AuR2{(Ph2P)2C(AuR)(AuCl)}], whereas it reacts with [N(PPh3)2][Au(acac)2](molar ratio 2 : 1) affording the pentanuclear complex [N(PPh3)2][{AuR2[(Ph2P)2C(AuR)]}2Au]. Another pentanuclear derivative [{AuR2[(Ph2P)2C(AuPPh3)]}2Au]ClO4 is obtained by treatment of [{AuR2[(Ph2P)2CH]}2Au]ClO4 with 2 equivalents of [Au(acac)(PPh3)]. The compounds were characterized by elemental analysis, IR and NMR spectroscopy, and some by fast atom bombardment mass spectrometry. The crystal structure of [AuR2{(Ph2P)2C(AuPPh3)2}]ClO4·CH2Cl2 was confirmed by X-ray diffraction analysis. The complex contains a triangular Au2C unit with a short Au ⋯ Au contact of 2.826(2)Å and a narrow Au(1)–C(1)–Au(2) angle of 85.4(7)°.

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