Acta Crystallographica Section C

Volume 65, Part 9 (September 2009)

metal-organic compounds


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Acta Cryst. (2009). C65, m361-m366    [ doi:10.1107/S0108270109031989 ]

Uncommon isonicotinamide supramolecular synthons in copper(II) complexes directed by nitrate and perchlorate anions

M. Ðakovic and Z. Popovic

Abstract: The title compounds, trans-diaquabis(nitrato-[kappa]O)bis(pyridine-4-carboxamide-[kappa]N1)copper(II), [Cu(NO3)2(C6H6N2O)2(H2O)2], (I), and trans-diaquatetrakis(pyridine-4-carboxamide-[kappa]N1)copper(II) bis(perchlorate), [Cu(C6H6N2O)4(H2O)2](ClO4)2, (II), are composed of mononuclear coordination entities involving CuII ions and isonicotinamide. In (I), the centrosymmetric tetragonally distorted octahedral copper(II) environment contains trans-related isonicotinamide and water molecules in the equatorial plane and two nitrate ions occupying the axial sites. In (II), the equatorial plane of the C2-symmetric distorted octahedron is built up of four isonicotinamide ligands, while water molecules occupy the axial positions. The complex molecules of (I) and (II) are linked into three-dimensional supramolecular frameworks by O-H...O and N-H...O hydrogen bonds. The nitrate and perchlorate ions are building blocks that disturb the robust R22(8) amide supramolecular motif commonly found in crystal structures of copper-isonicotinamide complexes.

Formula: [Cu(NO3)2(C6H6N2O)2(H2O)2] and [Cu(C6H6N2O)4(H2O)2](ClO4)2

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Structure factor file (CIF format) (122.1 kbytes)
[ doi:10.1107/S0108270109031989/gt3009Isup2.hkl ]
Contains datablock I

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Structure factor file (CIF format) (171.9 kbytes)
[ doi:10.1107/S0108270109031989/gt3009IIsup3.hkl ]
Contains datablock II

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