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Scientific article
English

Tetrahedral coordination by a seven-membered chelate ring

Published inInorganica Chimica Acta, vol. 275-276, p. 279-288
Publication date1998-07
Abstract

The ligand 1,2-bis(benzimidazol-2-yl)ethane (1a) and its N,N′-dioctyl (1b), N,N′-bis(3,5-dimethoxybenzyl) (1c) and 5,5′-dimethyl-N,N′-diethyl (1d) derivatives have been prepared. With MCl₂ the ligands give complexes [MLCl₂] (M=Mn, Fe, Co, Ni, Cu, Zn) which generally appear to have tetrahedral coordination geometry. X-ray crystal structures of [Cu(1c)Cl₂]·MeCN, [Cu(1c)Br₂] and [Mn(1d)Cl₂]·MeCN have been determined, and show tetrahedral coordination of the metal, the copper(II) complexes showing significant distortion from ideal tetrahedral character. Comparison with other results in the literature, coupled with simple molecular mechanics calculations, suggests that the tetrahedral character may be favoured by the seven-membered chelate ring in which puckering is limited by the presence of two double bonds in the ring.

eng
Keywords
  • Nitrogen ligand complexes
  • Chelate ring complexes
  • Transition metal complexes
  • Tetrahedral complexes
  • Seven-membered rings
  • Conformation
Citation (ISO format)
BROUGHTON, Vanessa, BERNARDINELLI, Gérald Hugues, WILLIAMS, Alan Francis. Tetrahedral coordination by a seven-membered chelate ring. In: Inorganica Chimica Acta, 1998, vol. 275-276, p. 279–288. doi: 10.1016/S0020-1693(97)00078-9
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ISSN of the journal0020-1693
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