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Scientific article
English

Synthesis and Stereochemical Properties of Chiral Square Complexes of Iron(II)

Published inChemistry, vol. 10, no. 19, p. 4839-4845
Publication date2004
Abstract

The hexadentate, and ditopic ligand 2,5-bis([2,2']bipyridin-6-yl)pyrazine yields a chiral, tetrameric, square-shaped, self-assembled species upon complexation with Fe2+ ions. The racemate of this complex was resolved with antimonyl tatrate as the chiral auxiliary. The purity of the enantiomer was determined by NMR spectroscopy, by using a chiral, diamagnetic shift reagent, and by circular dichroism (CD). The CD spectrum was also calculated by time-dependent density functional theory, and the correlation that was found between CD spectrum and configuration was confirmed by X-ray cristallography. When a "chiralised" version of the ligand was used instead, the corresponding iron complex was obtained in diastereomerically pure form.

Keywords
  • Chiral resolution
  • Density functional calculations
  • Diastereoselectivity
  • Iron
  • Molecular squares
  • Self-assembly
Citation (ISO format)
BARK, Thomas et al. Synthesis and Stereochemical Properties of Chiral Square Complexes of Iron(II). In: Chemistry, 2004, vol. 10, n° 19, p. 4839–4845. doi: 10.1002/chem.200400399
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ISSN of the journal0947-6539
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