title: Designed synthesis of a multimetallic system having Ru(4)Cu(2) core using trimetallic coordination of 2,2'-biimidazolate ion.
abstract: Synthesis of a novel hexametallic compound, [[(bpy)(2)Ru(biim)](4)Cu(2)](ClO(4))(4), (bpy = 2,2'-bipyridine and biim = 2,2'-biimidazolate dianion) from a monometallic complex, [(bpy)(2)Ru(biim)] and hydrated Cu(ClO(4))(2) is described. The X-ray structure consists of four octahedral ruthenium(II) centers arranged around a bimetallic Cu(2)-core. The four octahedral [(bpy)(2)Ru(biim)] units arranged around the Cu(2)-moiety that resulted in a propeller shape arrangement. The results of cryomagnetic measurements on the di-copper complex indicate that the two Cu(II) ions are coupled antiferromagnetically through the two bridging biim ligands. The EPR spectrum of the complex showed a typical axial spectrum. Optical spectra and redox properties of are reported. An intense absorption at 525 nm is assigned as Ru(dpi) --> pi(*)(bpy) transition.
authors.affiliation: Department of Inorganic Chemistry, Indian Association for the Cultivation of Science, Kolkata 700032, India. icsg@mahendra.iacs.res.in
authors.forename: Kunal K
authors.initials: KK
authors.lastname: Kamar
authors.forename: Larry R
authors.initials: LR
authors.lastname: Falvello
authors.forename: Philip E
authors.initials: PE
authors.lastname: Fanwick
authors.forename: Jinkwon
authors.initials: J
authors.lastname: Kim
authors.forename: Sreebrata
authors.initials: S
authors.lastname: Goswami