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Iron(III) complexes of tetradentate pyridylthioazophenol ligands: synthesis, spectroscopy, reactivity and structure

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A series of iron(III) complexes of novel tetradentate NSNO ligands (HL) has been prepared (L?=?2-(2-pyridylmethylthio)-phenylazo-(p-substituted)-phenolates). Dark brown [Fe(L)Cl2] complexes have been characterized by elemental analyses, spectroscopic and other measurements. Magnetic moments at 25°C of the [Fe(L)Cl2] complexes are in the range 5.75–5.87?BM. Single-crystal X-ray structure analysis of one of the complexes, [Fe(L1)Cl2], revealed that the Fe(III) complexes are octahedral and monomeric, with the chlorides in the cis position. Electrochemical studies of [Fe(L)Cl2] in DMF give quasi -reversible voltammograms. Reactivities of [Fe(L)Cl2] complexes towards a variety of unidentate ligands (X?=?CN - , , pyridine, imidazole) indicate that the two chlorides are nonequivalent. Magnetic susceptibility data of the series of resulting iron(III) complexes, [Fe(L)(X)Cl] n + ( n ?=?0, 1), are in accord with the Tanabe–Sugano theory.
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Keywords: Crystal structure; Iron(III); Pyridylthioazophenol ligands; Reactivity

Document Type: Research Article

Affiliations: 1: Department of Chemistry, Burdwan University, Golapbag, Burdwan 713104, India 2: Department of Physics, National Tsing Hua University, Hsinchu-300, Taiwan, ROC

Publication date: July 20, 2005

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