Journal
POLYHEDRON
Volume 28, Issue 4, Pages 695-702Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.poly.2008.12.016
Keywords
Schiff base; Bis(mu-chloro)-bridge; Ferromagnetic; Catalytic activity
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Funding
- Council of Scientific and Industrial Research, New Delhi, India [09/096(0519)/2007-EMR-I]
- European Union
- Spanish Ministerio de Educacion y Ciencia [MAT2007-61584, 2010 CSD 2007-00010]
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A new (mu-chloro)-bridged complex [Cu(HL)Cl](2) center dot 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 Cu-II complex with a pair of chlorine atoms bridging the copper atoms in a central Cu2Cl2 core. Each copper atom in I 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 I presents the highest ferromagnetic coupling [J = +43.2(5) cm(-1)] reported till date in any doubly chloro-bridged Cu-II 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. (C) 2009 Elsevier Ltd. All rights reserved.
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