Thakurta, Santarupa and Roy, Partha and Rosair, Georgina and Gómez-García, Carlos J. and Garribba, Eugenio and Mitra, Samiran (2009) Ferromagnetic exchange coupling in a new bis(µ-chloro)-bridged copper(II) Schiff base complex: synthesis, structure, magnetic properties and catalytic oxidation of cycloalkanes. Polyhedron, Vol. 28 (4), p. 695-702. ISSN 0277-5387. Article.
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A new (µ-chloro)-bridged complex [Cu(HL)Cl]2 . H2O (1) with the Schiff base ligand H2L, [2-((E)-(2-hydroxyethylimino)methyl)-4-bromophenol], has been synthesized and characterized by elemental analysis, IR, UV–Vis and EPR spectroscopic studies. X-ray diffraction studies show that 1, is a binuclear CuII complex with a pair of chlorine atoms bridging the copper atoms in a central Cu2Cl2 core. Each copper atom in 1 adopts a distorted square-pyramidal geometry with the imine nitrogen atom, alkoxy and phenoxy oxygen atoms from the Schiff base ligand and a bridging chlorine atom constructing the basal plane, while the apical position of the pyramid is occupied by the other bridging chlorine atom. Variable temperature susceptibility measurements show that complex 1 presents the highest ferromagnetic coupling [J = +43.2(5) cm−1] reported till date in any doubly chloro-bridged CuII dimer, and a weak interdimer antiferromagnetic coupling [J’ = -0.276(8) cm-1]. The complex also exhibits high catalytic activity towards the oxidation of hydrocarbons using H2O2 as terminal oxidant.
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