Binuclear Metal Complexes. LI. Synthesis and Characterization of the Tetrachloro-o-benzoquinone Adducts of Binuclear Iron(II) Complexes with 2-(Salicylideneamino)phenol and Its Substituted Homologs

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Abstract
Binuclear iron(III) complexes Fe2(R-R′-sap)2(tcoq) have been prepared by the oxidation of binuclear iron(II) complexes Fe2(R-R′-sap)2 with tetrachloro-o-benzoquinone (TCOQ), where H2(R-R′-sap) represents 2-(salicylideneamino) phenols with the substituent R on the salicylaldehyde ring and the R′ on the o-aminophenol ring. Magnetic measurements indicated the operation of an intramolecular antiferromagnetic spin-exchange interaction between the iron(III) ions, the exchange integrals being evaluated at −6–−10 cm−1. In both polarograms and cyclic voltammograms of these complexes, two redox processes attributable to Fe(III)–Fe(III)\ightleftharpoonsFe(III)–Fe(II)\ightleftharpoonsFe(II)–Fe(II) were observed.