Crystal structure of a heterometallic coordination polymer: catena-polytetra­aqua­cobalt(II)-μ-pyridine-26-di­carboxyl­ato-calcium(II)-μ-pyridine-26-di­carboxyl­ato dihydrate

摘要

In the crystal of the title polymeric complex, {[CoCa(C7H3NO4)2(H2O)4]·2H2O}n (>1), the Co^II ion is N,O,O′-chelated by two pyridine-2,6-di­carboxyl­ate anions in a distorted N2O4 octa­hedral geometry, and two carboxyl­ate O atoms of pyridine-2,6-di­carboxyl­ate anions bridge tetra­aqua­calcium(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 inter­actions [inter­centroid distances = 3.551 (1) and 3.746 (1) Å] involving inversion-related pyridine rings link the polymeric chains and lattice water mol­ecules to form a supra­molecular three-dimensional framework.