Structural Preferences in Phosphanylthiolato Platinum(II) Complexes

Josep Duran, Alfonso Polo, Julio Real, Jordi Benet-Buchholz, Miquel Solà, Albert Poater

Research output: Contribution to journalArticleResearchpeer-review

4 Citations (Scopus)

Abstract

© 2015 The Authors. Published by Wiley-VCH Verlag GmbH & Co. KGaA. The transition-metal complexes of heterotopic phosphanylthiolato ligands are useful in various reactions which depend on the stereochemistry of the complexes. Bis-chelate complex [Pt(SCH2CH2PPh2-κ2P,S)2](1) was obtained in good yields by direct base-free substitution reaction of the corresponding phosphanylthiol (HSCH2CH2PPh2) with K2PtCl4 or by oxidative addition of the same phosphanylthiol to Pt(PPh3)4. In agreement with the antisymbiosis rule, complex1 shows a cis-P,P arrangement in solid state crystallizing in the monoclinic system (C2/c). Density functional theory (DFT) calculations on 1 reveal the right characteristics for the preferred cis-P,P arrangement, rationalizing its formation. Direct base-free reaction of [PtCl2(1,5-cyclooctadiene)] with one equivalent of the same phosphanylthiol produce the trinuclear complex [PtCl(μ-SCH2CH2PPh2-κ2P,S)]3(2) instead of the binuclear structure common in palladium and nickel derivatives. Crystals of 2 are triclinic (P) showing a sulfur-bridging edge-sharing cyclic trinuclear complex with square-planar coordination geometry around the platinum atoms and a Pt3S3 cycle in skew-boat conformation. This preference for the trinuclear structure was rationalized mechanistically and through conceptual DFT.
Original languageEnglish
Pages (from-to)51-59
JournalChemistryOpen
Volume5
Issue number1
DOIs
Publication statusPublished - 1 Feb 2016

Keywords

  • P,S ligands
  • bis-chelate complexes
  • density functional calculations
  • platinum
  • trinuclear complexes

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