Oxo-bridged Complexes of Iron(III) Derived from 2-(2′-hydroxyphenyl)-benzothiazole and 2-(2′-hydroxyphenyl)benzimidazole Ligands
Iron(III) complexes containing substituted 2-(2′- oxyphenyl)benzothiazole (PBT) and 2-(2′-oxyphenyl)benzimidazole (PBI) ligands were prepared. These have mostly been characterized as oxo-bridged compounds by their magnetic susceptibility and EPR behavior with a general formula [Fe(L)2]2O. Most of the compounds have limited solubility, with the methoxy- and dimethylamino-substituted analogues being somewhat more soluble. Diffuse reflectance spectra and solution optical spectra indicate some effect of ligand basicity on the position of the phenolate to iron(III) charge-transfer band with electron-releasing substituents on the ligands shifting this band to lower energy. In the benzimidazole complex this band was shifted to higher energy relative to its benzothiazole counterpart. Electrochemical studies show irreversible electron transfer and indicate a stabilization of the iron(III) oxidation state relative to iron(II) by electron-releasing substituents on the ligand. Temperature dependent magnetic susceptibility reveals that most of the compounds are strongly antiferromagnetically coupled. © 1989.
C. G. Wahlgren et al., "Oxo-bridged Complexes of Iron(III) Derived from 2-(2′-hydroxyphenyl)-benzothiazole and 2-(2′-hydroxyphenyl)benzimidazole Ligands," Inorganica Chimica Acta, Elsevier, Jan 1989.
The definitive version is available at http://dx.doi.org/10.1016/S0020-1693(00)80787-2
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