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Crystal structure of a heterometallic coordination polymer: catena -poly[[[tetra-aqua-cobalt(II)]-μ-pyridine-2,6-di-carboxyl-ato-calcium(II)-μ-pyridine-2,6-di-carboxyl-ato] dihydrate].
In the crystal of the title polymeric complex, {[CoCa(C7 H3 NO4 )2 (H2 O)4 ]·2H2 O} n ( 1 ), the CoII ion is N , O , O '-chelated by two pyridine-2,6-di-carboxyl-ate anions in a distorted N2 O4 octa-hedral geometry, and two carboxyl-ate O atoms of pyridine-2,6-di-carboxyl-ate anions bridge tetra-aqua-calcium(II) units to form polymeric chains propagating along the b -axis direction. In the crystal, O-H⋯O and C-H⋯O hydrogen bonds, and offset π-π stacking inter-actions [inter-centroid distances = 3.551 (1) and 3.746 (1) Å] involving inversion-related pyridine rings link the polymeric chains and lattice water mol-ecules to form a supra-molecular three-dimensional framework.
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