Acta Crystallographica Section C

Crystal Structure Communications

Volume 65, Part 7 (July 2009)

metal-organic compounds


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Acta Cryst. (2009). C65, m246-m249    [ doi:10.1107/S0108270109017107 ]

Two different one-dimensional structural motifs in [catena-{Cu(tacn)}2Pd(CN)4]Br2·[catena-Cu(tacn)Pd(CN)4]2·H2O (tacn is 1,4,7-triazacyclononane)

J. Kuchár and J. Cernák

Abstract: The title compound, catena-poly[[bis[(triazacyclononane-[kappa]3N,N',N'')copper(II)]-di-[mu]-cyanido-[kappa]4N:C-palladate(II)-di-[mu]-cyanido-[kappa]4C:N] dibromide bis[[(triazacyclononane-[kappa]3N,N',N'')copper(II)]-[mu]-cyanido-[kappa]2N:C-[dicyanidopalladate(II)]-[mu]-cyanido-[kappa]2C:N] monohydrate], {[Cu2Pd(CN)4(C6H15N3)2]Br2·[Cu2Pd2(CN)8(C6H15N3)2]·H2O}n, (I), was isolated from an aqueous solution containing tacn·3HBr (tacn is 1,4,7-triazacyclononane), Cu2+ and tetracyanidopalladate(2-) anions. The crystal structure of (I) is essentially ionic and built up of 2,2-electroneutral chains, viz. [Cu(tacn)(NC)-Pd(CN)2-(CN)-], positively charged 2,4-ribbons exhibiting the composition {[Cu(tacn)(NC)2-Pd(CN)2-Cu(tacn)]2n+}n, bromide anions and one disordered water molecule of crystallization. The O atom of the water molecule occupies two unique crystallographic positions, one on a centre of symmetry, which is half occupied, and the other in a general position with one-quarter occupancy. One of the tacn ligands also exhibits disorder. The formation of two different types of one-dimensional structural motif within the same structure is a unique feature of this compound.

Formula: [Cu2Pd(CN)4(C6H15N3)2]Br2·[Cu2Pd2(CN)8(C6H15N3)2]·H2O

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