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A remarkable cis- and trans-spanning dibenzylidene acetone diphosphine chelating ligand (dbaphos)

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Published copy (DOI)

Author(s)

  • A.G. Jarvis
  • P.E. Sehnal
  • S.E. Bajwa
  • A.C. Whitwood
  • X. Zhang
  • M.S. Cheung
  • Z. Lin
  • I.J.S. Fairlamb

Department/unit(s)

Publication details

JournalChemistry - A European Journal
DatePublished - 3 May 2013
Issue number19
Volume19
Pages (from-to)6034-6043
Original languageEnglish

Abstract

A multidentate and flexible diolefin-diphosphine ligand, based on the dibenzylidene acetone core, namely dbaphos (1), is reported herein. The ligand adopts an array of different geometries at Pt, Pd and Rh. At Pt the dbaphos ligand forms cis- and trans-diphosphine complexes and can be defined as a wide-angle spanning ligand. H NMR spectroscopic analysis shows that the β-hydrogen of one olefin moiety interacts with the Pt centre (an anagostic interaction), which is supported by DFT calculations. At Pd and Rh, the dbaphos ligand exhibits both olefin and phosphine interactions with the metal centres. The Pd complex of dbaphos is dinuclear, with bridging diphosphines. The complex exhibits the coordination of one olefin moiety, which is in dynamic exchange (intramolecular) with the other "free" olefin. The Pd complex of dbaphos reacts with iodobenzene to afford trans-[Pd(dbaphos)I(Ph)]. In the case of Rh, dbaphos coordinates to form a structure in which the phosphine and olefin moieties occupy both axial and equatorial sites, which stands in contrast to a related bidentate olefin, phosphine ligand ("Lei" ligand), in which the olefins occupy the equatorial sites and phosphines the axial sites, exclusively.

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