Abstract
The neutral rhenium(V) oxo complex [ReO{S(CH2)2SCH2CONCH2S}] reacted with tertiary phosphines PMe2Ph or PMePh2 to give the rhenium(V) species [ReO(NS2)(PR′3)] (PR′3 = PMe2Ph 1, or PMePh2 2), with loss of a SCH2CH2 group. The introduction of dimethyl substituents at C(6) of the tetradentate ligand prevents C–S bond cleavage and [ReO(NS2)(PR′3)] type complexes were formed (PR′3 = PMe2Ph 3, or PMePh2 4). The crystal and molecular structures of complexes 1 and 4 have been determined. Complex 1 is essentially square pyramidal with an apical oxo group and a PNS2 donor set in the basal sites. The geometry of 4 is essentially octahedral with a thiolate sulfur of the NS3 ligand trans to the oxo group.
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