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Issue 2, 2010
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Acetylenedithiolate as directional bridging ligand in cobalt(I) alkyne platinum dithiolato bimetallic complexes

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Abstract

The η2-C,C′-acetylenedithiolate (acdt2−) complex K[(triphos)Co(acdt)], K-5, {triphos = 1,1,1-tris(diphenylphosphinomethyl)ethane} was obtained by consecutive removal of S-protection groups in [(triphos)Co(1)]PF6, 3-PF6 (1 = 1-Trimethylsilyl-7-phenyl-3,6-dithiahept-4-ine). Reaction of K-5 with selected Pt(II) salts resulted in the formation of the new heterobimetallic complexes [(phen)Pt(5)]BPh4, 6-BPh4, (phen = 1,10-phenanthroline) and [(dppe)Pt(5)]BPh4, 7-BPh4, {dppe = 1,2-bis(diphenylphosphino)ethane}, which were fully characterized. X-ray diffraction studies showed that Co and Pt are linked by acdt2− in the η2-C,C′-κ2-S,S′-bridging mode. The electronic structure of 6-BPh4 and 7-BPh4 was investigated by electronic absorption spectroscopy, cyclic voltammetry and X-band EPR spectroscopy of neutral 7. In addition, NMR spectroscopy, X-ray diffraction and reactivity studies with the alkyne complexes [(PMe3)3Co(1)]-PF6, 2-PF6, with 3-PF6 and the intermediate product [(triphos)Co{η2-(S)C2(SCH2Ph)}], 4, uncovered the flexibility of the CoC2S2-moiety within the persisting complex scaffold throughout the synthetic scheme.

Graphical abstract: Acetylenedithiolate as directional bridging ligand in cobalt(i) alkyne platinum dithiolato bimetallic complexes

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Publication details

The article was received on 15 Jul 2009, accepted on 18 Nov 2009 and first published on 26 Nov 2009


Article type: Paper
DOI: 10.1039/B913859E
Citation: Dalton Trans., 2010,39, 624-631
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    Acetylenedithiolate as directional bridging ligand in cobalt(I) alkyne platinum dithiolato bimetallic complexes

    W. W. Seidel, M. J. Meel, F. Hupka and J. J. Weigand, Dalton Trans., 2010, 39, 624
    DOI: 10.1039/B913859E

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