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Issue 4, 1998
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X-Ray crystallographic and extended X-ray absorption fine structure studies of gold(I) complexes containing weak intermolecular interactions

Abstract

The crystal and molecular structures of [Au2{S2CN(C2H4OMe)2}2], [Au(PPh3)(SCH2CO2H)], [Au(PPh3)(SCMe2CO2H)] and [Au(PPh3)(SCH2CO2Me)] have been determined. All compounds contain an approximately linear primary co-ordination sphere of ligands about the gold atom, but they differ markedly in their type of intermolecular interaction. In [Au2{S2CN(C2H4OMe)2}2] the supramolecular array is dominated by an almost linear, polymeric backbone of gold atoms with alternate gold–gold contacts of 2.7902(6) (intramolecular) and 3.1572(7) Å (intermolecular), whereas in [Au(PPh3)(SCH2CO2H)] dimers associated through long gold–sulfur contacts of 3.131(2) Å are held together in a polymeric chain by hydrogen bonding between neighbouring carboxylic acid residues. The increased steric bulk of the thiolate ligand in [Au(PPh3)(SCMe2CO2H)] caused by the methyl groups on the α-carbon atom precludes association of the gold centres, but hydrogen bonding between carboxylates as in the SCH2CO2H compound causes dimerisation. Compound [Au(PPh3)(SCH2CO2Me)] exists as a monomer with no evidence of weak intermolecular interactions. Analysis of ambient-temperature EXAFS (extended X-ray absorption fine structure) measurements on solid samples of the first two compounds yield gold–gold separations of 2.775(2) and 3.271(6) Å and 4.188(15) Å, respectively. Gold–sulfur separations of 2.290(1) and 3.532(8) and of 2.329(4) and 3.124(19) Å, respectively, are also in good agreement with X-ray data.

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Article type: Paper
DOI: 10.1039/A707650I
Citation: J. Chem. Soc., Dalton Trans., 1998,0, 675-682
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    X-Ray crystallographic and extended X-ray absorption fine structure studies of gold(I) complexes containing weak intermolecular interactions

    P. Bishop, P. Marsh, A. K. Brisdon, B. J. Brisdon and M. F. Mahon, J. Chem. Soc., Dalton Trans., 1998, 0, 675
    DOI: 10.1039/A707650I

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