Theoretical, structural and NMR studies of fluxionality in thiolato-bridged platinum (II)-platinum (IV) dinuclear complexes

Núria Duran, Pilar González-Duarte, Agustí Lledós, Teodor Parella, Joan Sola, Gregori Ujaque, William Clegg, Kelly A. Fraser

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Abstract

The complex [(dppe)Pt{μ,-SCH(CH2CH2)2NMe} 2PtIMe3] has been synthesised and structurally characterised by X-ray diffraction. It consists of dinuclear sulfur-bridged enantiomeric pairs containing a folded PtII (μ-S)2PtIV ring with the thiolate substituents in anti configuration. 1D and 2D variable temperature 1H, 13C, 31P and 195Pt NMR data show that the complex has several different fluxional modes and are consistent with the presence in solution of the four possible anti-isomers, and the two conformers with both thiolate ligands and the iodine atom in a cisoid disposition. Theoretical ab initio studies on the model complex [(H2PCH2CH2PH2)Pt(μ-SCH 3)2PtIMe3] have led to an estimation of the relative energies of the different isomers, confirming the interpretation of the NMR data. The transition states for the interconversion between the most stable isomers have been located. NMR data and theoretical results strongly support a mechanism for the pyramidal sulfur inversion, which involves splitting of one of the two PtIV-S bonds, followed by rotation about its neighbouring PtII-S bond. © 1997 Elsevier Science S.A.
Original languageEnglish
Pages (from-to)89-102
JournalInorg. Chim. Acta
Volume265
Issue number1-2 PART II
DOIs
Publication statusPublished - 15 Nov 1997

Keywords

  • Ab initio calculations
  • Crystal structures
  • Fluxionality
  • Platinum complexes
  • Sulfur-bridged complexes

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