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Issue 16, 2000
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Synthesis and reactivity of ruthenium(II) complexes containing hemilabile phosphine–thiopheneligands

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The syntheses of two new phosphinethiophene ligands, 2-(2′-{diphenylphosphino}phenyl)thiophene (dpppth) and 3′-diphenylphosphino-2,2′∶5′,2′′-terthiophene (dppterth) are reported. These ligands react with [RuCl2(PPh3)3] to give [RuCl2(dpppth-P,S)2] and [RuCl2(dppterth-P,S1)2], respectively, which both exist as a mixture of two isomers in solution. [RuCl2(dpppth-P,S)2] reacts at 25 °C with carbon monoxide to yield a mixture of [RuCl2(CO)(dpppth-P)(dpppth-P,S)] and [RuCl2(CO)2(dpppth-P)2], while [RuCl2(dppterth-P,S1)2] reacts with CO under the same conditions to give only the monocarbonyl complex [RuCl2(CO)(dppterth-P)(dppterth-P,S1)]. Displacement of one of the dppterth ligands in [RuCl2(dppterth-P,S1)2] with bis(diphenylphosphino)methane (dppm) yields cis-[RuCl2(dppm)(dppterth-P,S1)] which isomerizes in solution to trans-[RuCl2(dppm)(dppterth-P,S1)]. These complexes react with carbon monoxide to give trans-[RuCl2(CO)(dppm)(dppterth-P)] and cis-[RuCl2(CO)(dppm)(dppterth-P)], respectively, in which the thiophene end of the dppterth ligand is displaced by CO. The electronic spectra of these complexes are reported. Crystal structures for [RuCl2(dpppth-P,S)2], [RuCl2(CO)(dppterth-P)(dppterth-P,S1)] and cis-[RuCl2(dppterth-P,S1)(dppm)] are reported.

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Publication details

The article was received on 08 Mar 2000, accepted on 13 Jun 2000 and first published on 20 Jul 2000

Article type: Paper
DOI: 10.1039/B001898H
J. Chem. Soc., Dalton Trans., 2000, 2729-2737

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    Synthesis and reactivity of ruthenium(II) complexes containing hemilabile phosphine–thiophene ligands

    O. Clot, M. O. Wolf, G. P. A. Yap and B. O. Patrick, J. Chem. Soc., Dalton Trans., 2000, 2729
    DOI: 10.1039/B001898H

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