Acta Cryst. (2009). E65, m587-m588  [ doi:10.1107/S1600536809014913 ]

catena-Poly[[diaquacobalt(II)]-bis(-4-fluorobenzoato-²O:O')]

F.-F. Zhou and B.-S. Zhang

Abstract: The hydrothermal reaction of CoCO₃ and 4-fluorobenzoic acid afforded the title Co^II complex, [Co(C₇H₄FO₂)₂(H₂O)₂]_n. The Co^II atom is located on an inversion center and is coordinated by six O atoms from two water molecules and four ₂-carboxylate groups of 4-fluorobenzoate anions, forming a distorted CoO₆ octahedron, with Co-O bond lengths in the range 2.071 (2)-2.130 (2) Å. All adjacent O-Co-O angles are in the range 84.78 (6)-95.22 (6)° and opposite angles are 180.0°. Each -carboxylate group of the 4-fluorobenzoate anions bridges two symmetry-related Co^II atoms. Hydrogen-bonding interactions of the coordinated water molecules further connect the cobalt-carboxylate units, forming layers perpendicular to the a axis. The cobalt-oxygen layers are encased in a sandwich-like fashion by layers of -stacked 4-fluorobenzoate anions. Within these layers the benzene rings of the 4-fluorobenzoate anions are -stacked, with centroid-centroid distances of 3.432 (4) Å.

Online 30 April 2009

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