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

作者：Dakovic Marijana; Popovic Zora^*

来源：Acta Crystallographica Section C-Crystal Structure Communications, 2009, 65(9): M361-M366.

DOI：10.1107/S0108270109031989

The title compounds, trans-diaquabis(nitrato-kappa O)bis(pyridine-4-carboxamide-kappa N-1) copper(II), [Cu(NO3)(2)(C6H6N2O)(2)(H2O)(2)], (I), and trans-diaquatetrakis(pyridine-4-carboxamide- kappa N-1 copper(II) bis(perchlorate), [Cu(C6H6N2O)(4)(H2O)(2)](ClO4)(2), (II), are composed of mononuclear coordination entities involving Cu-II 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 C-2-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 center dot center dot center dot O and N-H center dot center dot center dot O hydrogen bonds. The nitrate and perchlorate ions are building blocks that disturb the robust R-2(2)(8) amide supramolecular motif commonly found in crystal structures of copper-isonicotinamide complexes.

• 出版日期2009-9