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

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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.

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Kimblin, C., Churchill, D. G., Bridgewater, B. M., Girard, J. N., Quarless, D. A., & Parkin, G. (2001). Tris(mercaptoimidazolyl)hydroborato complexes of cobalt and iron, [TmPh]2M (M = Fe, Co): Structural comparisons with their tris(pyrazolyl)hydroborato counterparts. Polyhedron, 20(15–16), 1891–1896. https://doi.org/10.1016/S0277-5387(01)00780-X

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