Poly[[diaquabis[mu(2)-2-(4-pyridinio)propane-1,3-dionato-kappa2O:O']cobalt(II)] dinitrate].
The title compound, {[Co(C(8)H(7)NO(2))(2)(H(2)O)(2)](NO(3))(2)}(n), is the first d-metal ion complex involving bidentate bridging of a beta-dialdehyde group. The Co(2+) 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) A] and two axial aqua ligands [Co-O = 2.0631 (13) A]. 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) A, and N...O = 2.864 (3) A] is essential for the crystal packing.
Domasevitch
Konstantin V
KV
Inorganic Chemistry Department, Kiev University, Volodimirska Street 64, Kiev 01033, Ukraine. dk@univ.kiev.ua