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Paital, Alok Ranjan,Hong, Chang Seop,Kim, Hyoung Chan,Ray, Debashis WILEY-VCH Verlag 2007 European journal of inorganic chemistry Vol.2007 No.12
<P>A new family of tetracopper clusters [Cu<SUB>4</SUB>(μ<SUB>4</SUB>-X)L<SUB>2</SUB>]ClO<SUB>4</SUB>·nH<SUB>2</SUB>O (1a–c) [X = Cl, Br, I; n = 12, 2, 2; H<SUB>3</SUB>L = 2-(2′-hydroxyphenyl)-1,3-bis[4-(2-hydroxyphenyl)-3-azabut-3-enyl]-1,3-imidazolidine] have been synthesised and characterised. The X-ray crystal structure of 1a reveals that the template action of the spherical Cl<SUP>–</SUP> anion (μ<SUB>4</SUB>-Cl<SUP>–</SUP>), which features a unique rectangular planar bridging mode, is responsible for the self-assembly of two [Cu<SUB>2</SUB>L]<SUP>+</SUP> units in complex 1a. In this family of complexes the spherical halides serve as templates to assemble the dimeric unit into tetrameric complexes, which gives an insight into the role of the halide bridge in tetranuclear complex formation. The capacity of this bridge to mediate magnetic coupling has been examined by bulk magnetic measurements for complex 1a. (© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2007)</P> <B>Graphic Abstract</B> <P> <img src='wiley_img/14341948-2007-2007-12-EJIC200600917-fig000.gif' alt='wiley_img/14341948-2007-2007-12-EJIC200600917-fig000'> </P>