Synthesis, molecular structure and spectroscopic, electrochemical and magnetic properties of a new dinuclear iron complex containing µ-sulfate-di-µ-alkoxo bridges: evaluating the influence of the sulfate bridge on the physicochemical properties of the di-µ-alkoxo-diiron unit

Journal of the Brazilian Chemical Society

Adolfo Horn Jr.²  Ivo Vencato¹  Adailton J. Bortoluzzi¹  Valderes Drago¹  Miguel A. Novak¹  Ademir Neves¹ 

[1] ,Universidade Estadual do Norte Fluminense Laboratório de Ciências Químicas Campos dos Goytacazes RJ ,Brazil

关键词: diiron complexes;    structural models;    PAPs;    X-ray structure;   

DOI  :  10.1590/S0103-50532006000800015

来源: SciELO

【 摘 要 】

Complex [Fe2III(BPClNOL)2(SO4)] 3 was synthesized through the reaction of the pro-ligand N-(2-hydroxybenzyl)-N-(2-pyridylmethyl)[(3-chloro)(2-hydroxy)]propylamine (H2BPClNOL) and FeSO4.7H2O. The maximum absorption for the oxidized compound was at 519 nm (epsilon = 1.40X10³ dm³ mol-1 cm-1) while that of the mixed-valence compound was at 439 nm (epsilon = 9.8X10² dm³ mol-1 cm-1). The redox process to transform the oxidized compound to the mixed-valence form occurs at E1/2 = -0.843 V vs. Fc/Fc+. The Mössbauer spectrum confirms the presence of FeIII high spin ions and the magnetic studies reveal a weak antiferromagnetically coupled dimer, J/kB = - 15 K ( J = -10.4 cm-1). Complex 3 is the third of a family of dinuclear iron compounds synthesized with the H2BPClNOL ligand ([Fe2III(BPClNOL)2 (OAc)]+ 1, [Fe2III(BPClNOL)2(H2O) 2]2+ 2). Analysis of the physicochemical properties of these complexes allowed us to infer that the number and kind of bridging groups have a significant influence on their electrochemical and UV-Vis properties.

【 授权许可】

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