Tris(mercaptoimidazolyl)hydroborato complexes of cobalt and iron, [TmPh]2M (M = Fe, Co): Structural comparisons with their tris(pyrazolyl)hydroborato counterparts

  • Kimblin C
  • Churchill D
  • Bridgewater B
 et al. 
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Abstract

The tris(mercaptophenylimidazolyl)borate iron and cobalt complexes [TmPh]2M (M = Fe, Co) have been synthesized by reaction of [TmPh]Tl with MI2. Structural characterization by X-ray diffraction demonstrates that the potentially tridentate [TmPh] ligand binds through only two sulfur donors in these 'sandwich' complexes and that the 'tetrahedral' metal centers supplement the bonding by interactions with the two B-H groups. Comparison of the structures of [TmPh]2M (M = Fe, Co) with the related tris(pyrazolyl)borate [TpPh]2M counterparts indicates that the tris(mercaptoimidazolyl) ligand favors lower primary coordination numbers in divalent metal complexes. The trivalent complexes, {[TpPh]2Fe}[ClO4] and {[pzBmMe]2Co}I however, exhibit octahedral coordination, with the ligands binding using their full complement of donor atoms. © 2001 Elsevier Science Ltd.

Author-supplied keywords

  • Complexes of cobalt and iron
  • Sandwich complexes
  • Structural characterization

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Authors

  • Clare Kimblin

  • David G. Churchill

  • Brian M. Bridgewater

  • Jennifer N. Girard

  • Duncan A. Quarless

  • Gerard Parkin

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