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Complexes of structural analogues of terpyridyl with iron and zinc; the x-ray crystal structure of bis[2,6-bis(benzimidazol2-yl)pyridine]iron(II) trifluoromethylsulphonate bis-ethanol solvate

Published inPolyhedron, vol. 11, no. 6, p. 635-646
Publication date1992
Abstract

Complexes of iron(II) and zinc(II) with a series of tridentate ligands of the type [2,6-bis(benz-X-azol-2-yl)pyridine] (X = imid, thi, ox) have been prepared. The crystal structure of [Fe(2,6-bis(benzimidazol-2-yl)pyridine)2](CF₃SO₃)₂·2C₂H₅OH shows the iron(II) to be low spin with a meridional octahedral coordination by two tridentate ligands. ⁵⁷Fe Mössbauer spectra of the complexes [FeL₂]²⁺ show strong dependence of ligand strength on the non-coordinated heteroatom, X, of the ligand: benzimidazole ligands give low spin complexes, benzoxazoles give high spin complexes and benzthiazoles show spin-crossover properties. Derivatization of the imidazole nitrogen has only a small effect on the ligand strength. The complexes [FeLX₂] (X = anion) are all high spin. Partial dissociation is observed in solvents with a strong affinity for iron(II); the iron(II) complexes show metal-to-ligand charge transfer transitions whose intensity depends strongly on the spin state of the iron.

Citation (ISO format)
RUTTIMANN, Stéphane Joséph et al. Complexes of structural analogues of terpyridyl with iron and zinc; the x-ray crystal structure of bis[2,6-bis(benzimidazol2-yl)pyridine]iron(II) trifluoromethylsulphonate bis-ethanol solvate. In: Polyhedron, 1992, vol. 11, n° 6, p. 635–646. doi: 10.1016/S0277-5387(00)83320-3
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