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From the same journal

Contrasting photochemical and thermal reactivity of Ru(CO)(2)(PPh3)(dppe) towards hydrogen rationalised by parahydrogen NMR and DFT studies

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Published copy (DOI)

Author(s)

  • D Blazina
  • J P Dunne
  • S Aiken
  • S B Duckett
  • C Elkington
  • J E McGrady
  • R Poli
  • S J Walton
  • M S Anwar
  • J A Jones
  • H A Carteret

Department/unit(s)

Publication details

JournalDalton Transactions
DatePublished - 2006
Issue number17
Number of pages9
Pages (from-to)2072-2080
Original languageEnglish

Abstract

The synthesis, characterisation and thermal and photochemical reactivity of Ru( CO)(2)( PPh3)( dppe) 1 towards hydrogen are described. Compound 1 proved to exist in both fac ( major) and mer forms in solution. Under thermal conditions, PPh3 is lost from 1 in the major reaction pathway and the known complex Ru(CO)(2)( dppe)(H)(2) 2 is formed. Photochemically, CO loss is the dominant process, leading to the alternative dihydride Ru(CO)(PPh3)(dppe)( H)(2) 3. The major isomer of 3, viz. 3a, contains hydride ligands that are trans to CO and trans to one of the phosphorus atoms of the dppe ligand but a second isomer, 3b, where both hydride ligands are trans to distinct phosphines, is also formed. On the NMR timescale, no interconversion of 3a and 3b was observed, although hydride site interchange is evident with activation parameters of Delta H-double dagger = 95 +/- 6 kJ mol(-1) and Delta S-double dagger = 26 +/- 17 J K-1 mol(-1). Density functional theory confirms that the observed species are the most stable isomeric forms, and suggests that hydride exchange occurs via a transition state featuring an eta(2)- coordinated H-2 unit.

    Research areas

  • SUBSTITUTED TRIRUTHENIUM CLUSTERS, NONRIGID 6-COORDINATE MOLECULES, NUCLEAR MAGNETIC-RESONANCE, INDUCED POLARIZATION, OXIDATIVE ADDITION, HOMOGENEOUS HYDROGENATION, CATALYTIC-HYDROGENATION, POLYPHOSPHINE LIGANDS, BINUCLEAR COMPLEXES, DIHYDRIDE COMPLEXES

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