Acta Crystallographica Section C

Crystal Structure Communications

Volume 64, Part 3 (March 2008)

metal-organic compounds


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Acta Cryst. (2008). C64, m105-m107    [ doi:10.1107/S0108270108001054 ]

Poly[[diaquabis[[mu]2-2-(4-pyridinio)propane-1,3-dionato-[kappa]2O:O']cobalt(II)] dinitrate]

K. V. Domasevitch

Abstract: The title compound, {[Co(C8H7NO2)2(H2O)2](NO3)2}n, is the first d-metal ion complex involving bidentate bridging of a [beta]-dialdehyde group. The Co2+ ion is situated on an inversion centre and adopts an octahedral coordination with four equatorial aldehyde O atoms [Co-O = 2.0910 (14) and 2.1083 (14) Å] and two axial aqua ligands [Co-O = 2.0631 (13) Å]. The title compound has a two-dimensional square-grid framework structure supported by propane-1,3-dionate O:O'-bridges between the metal ions. The organic ligand itself possesses a zwitterionic structure, involving conjugated anionic propane-1,3-dionate and cationic pyridinium fragments. Hydrogen bonding between coordinated water molecules, the pyridinium NH group and the nitrate anions [O...O = 2.749 (2) and 2.766 (3) Å, and N...O = 2.864 (3) Å] is essential for the crystal packing.

Formula: [Co(C8H7NO2)2(H2O)2](NO3)2

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