0000000000459744
AUTHOR
Pekka Knuuttila
Crystal and molecular structures of hexaaquazinc(II)isonicotinate n-oxide and catena-diaquabis-μ-(isonicotinato n-oxide)cadmium(II)
Abstract [Zn(H2O)6](N-inicO)2 is an ionic compound made up of hexaaqua metal cations and isonicotinate N-oxide anions. It forms an isomorphic series with the corresponding Mg2+, Fe2+, Co2+ and Ni2+ compounds. In [Cd(N-inicO)2(H2O)2]n complex, coordination takes place through the NO oxygen and one of the (COO) oxygens with ligand forming thus a double bridge between Cd2+ ions. The structure is an endless chain stretching diagonally through the unit cell. The coordination polyhedron in both compounds is almost undistorted octahedron.
The crystal and molecular structures of hexaquocobalt(II) diisonicotinate N-oxide and its isostructural nickel(II) homologue
Abstract In this experiment the crystal and molecular structures of hexaaquocobalt(II)diisonicotinate N-oxide were determined from three-dimensional X-ray diffraction dat. The crystals belong to the monoclinic space group P2 1 /c. The cell parameters are a = 7.74(2), b = 9.826(2), c = 11.474(2) A , β = 91.08(2)°, V = 873.2(3) A 3 for the Co-complex, and a = 7.765(2), b = 9.725(6), c = 11.363 A , β = 91.20(3)°, V = 857.9(7) A 3 for the Ni-complex. Both structures were refined to a final R-value of 0.045. The X-ray structure analysis showed that there are metal(II)hexaquo cations and isonicotinate N-oxide anions formulated as Co(H 2 O) 6 2+ 2L − and Ni(H 2− O) 6 2+ 2L − in the structures. The…
The preparation, IR spectrum and structure of the Di-μ3-hydroxo-μ-sulphatotetrakis-μ-(isonicotinato-N-oxide)tetraaqua-tetracopper(II)
Abstract A very unusual new copper(II) complex with isonicotinate N-oxide (N-inicO), Cu4(N-inicO)4SO4(OH)2(H2O)4 has been prepared and its crystal and molecular structure determined from three dimensional X-ray diffraction data. The crystals belong to the monoclinic space group C2. The cell parameters are a = 19.089(8), b = 6.884(3), c = 19.533(12) A, β = 140.9(3)°, dobs = 1.99, dcalc = 2.01 and Z = 2. The structure was refined to a final R-value of 0.062. The monomeric tetranuclear complex resembles a space ship with the sulphate group at its top and pyridine rings as wings. Two copper atoms are very close to each other in the molecule; the Cu1Cu1′ distance is 2.885 A. The coordination ar…