Synthesis and characterization of diphenylglyoximato cobalt(III) complexes. The molecular structures of trans-bis(diphenylglyoximato)(alkyl)(pyridine)cobalt(III), with alkyl = CH 2SiMe3, CH2CMe3 and CF3

Paul J. Toscano, Linda Lettko, E. James Schermerhorn, John Waechter, Kevin Shufon, Shuncheng Liu, Evgeny V. Dikarev, Jon Zubieta

Research output: Contribution to journalArticle

15 Scopus citations

Abstract

A series of Co(III) diphenylglyoximato (dpgh) complexes, pyCo(dpgh) 2R, with R = Cl (2a), CH3 (3a), CH2Me (4a), (CH2)2Me (5a), (CH2)3Me (6a), CHMe2 (7a), CH2SiMe3 (8a), CH 2CMe3 (9a), CH2CH=CH2 (10a), CH 2Ph (11a), and CF3 (12a) were prepared, using Co(dpgh)(dpgh2)Cl2 (1a) as an entry to this system. The compounds were thoroughly characterized by 1H and 13C NMR spectroscopy, the spectra of which were compared to the corresponding Co(III) dimethylglyoximato (DH) complexes, pyCo(DH)2R (2b-12b). The NMR results suggest that the dpgh ligand is less electron-donating than DH. X-ray diffraction studies of complexes 8a, 9a and 12a demonstrate that subtle, but detectable structural changes occur upon substitution of dpgh for DH, due to increased interactions of the axial alkyl ligand with the equatorial ligand set.

Original languageEnglish (US)
Pages (from-to)2809-2820
Number of pages12
JournalPolyhedron
Volume22
Issue number20
DOIs
StatePublished - Sep 1 2003

Keywords

  • Cobaloximes
  • Cobalt(III) complexes
  • Crystal structures
  • Dimethylglyoximato ligands
  • Diphenylglyoximato ligands
  • NMR spectroscopy

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Inorganic Chemistry
  • Materials Chemistry

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