Acta Crystallographica Section C

Crystal Structure Communications

Volume 58, Part 10 (October 2002)


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Acta Cryst. (2002). C58, m523-m528    [doi:10.1107/S0108270102015731]

Low-dimensional compounds containing cyano groups. IV. Bis(2,2'-bipyridine-[bold kappa]2N,N1)(dicyanamido-[bold kappa]N')copper(II) perchlorate and [bold mu]-dicyanamido-[bold kappa]2N1:N5-bis[bis(2,2'-bipyridine-[bold kappa]2N,N')copper(II)] triperchlorate ethanol hemisolvate, complexes with unusual dicyanamide coordination

I. Potocnák, M. Burcák, W. Massa and L. Jäger

Abstract: From reaction mixtures containing the same reagents, the two novel title complexes, with unusual coordination modes of the dicyanamide (dca) ligand, have been prepared. The first compound, [Cu(C2N3)(C10H8N2)2]ClO4, represents a relatively rare class of compounds, with the dca ligand coordinated in a monodentate manner. Its structure is formed by the [Cu(bpy)2{N(CN)2}]+ complex cation (bpy is 2,2'-bipyridine) and a ClO4- anion, which does not enter the inner coordination sphere. The Cu centre is five-coordinate within a strongly distorted trigonal bipyramid to two bpy molecules and one dca ligand, which is coordinated through one nitrile N atom in the equatorial plane. The second compound, [Cu2(C2N3)(C10H8N2)4](ClO4)3·0.5C2H6O, contains dca coordinated in the more common bidentate manner, but instead of a chain structure, a unique binuclear complex is formed. The asymmetric unit consists of the [Cu(bpy)2{N(CN)2}(bpy)2Cu]3+ binuclear complex cation, the charge of which is neutralized by three uncoordinated perchlorate anions, and a half-molecule of ethanol. Both Cu centres in the cation are five-coordinate, adopting a slightly distorted trigonal-bipyramidal environment.

Formula: [Cu(C2N3)(C10H8N2)2]ClO4 and [Cu2(C2N3)(C10H8N2)4](ClO4)3·0.5C2H6O

Online 30 September 2002

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