title: Uncommon isonicotinamide supramolecular synthons in copper(II) complexes directed by nitrate and perchlorate anions.
abstract: The title compounds, trans-diaquabis(nitrato-kappaO)bis(pyridine-4-carboxamide-kappaN(1))copper(II), [Cu(NO(3))(2)(C(6)H(6)N(2)O)(2)(H(2)O)(2)], (I), and trans-diaquatetrakis(pyridine-4-carboxamide-kappaN(1))copper(II) bis(perchlorate), [Cu(C(6)H(6)N(2)O)(4)(H(2)O)(2)](ClO(4))(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...O and N-H...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.
authors.affiliation: Laboratory of General and Inorganic Chemistry, Department of Chemistry, Faculty of Science, University of Zagreb, Horvatovac 102a, HR-10000 Zagreb, Croatia.
authors.forename: Marijana
authors.initials: M
authors.lastname: Daković
authors.forename: Zora
authors.initials: Z
authors.lastname: Popović
mesh_terms: D000838:Anions / Q000737:chemistry*; D003300:Copper; D018360:Crystallography, X-Ray; D006860:Hydrogen Bonding; D008958:Models, Molecular; D009536:Niacinamide / Q000737:chemistry*; D009566:Nitrates / Q000737:chemistry*; D009942:Organometallic Compounds / Q000737:chemistry*; D010472:Perchlorates / Q000737:chemistry*
chemical_list: D000838:Anions; D009566:Nitrates; D009942:Organometallic Compounds; D010472:Perchlorates; C544576:trans-diaquabis(nitrato-kappaO)bis(pyridine-4-carboxamide-kappaN(1))copper(II); D009536:Niacinamide; C027681:isonicotinamide; D003300:Copper; C494474:perchlorate