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A heteronuclear compound, K2 [ Co (Dipc) 2 ] @ 7H2O (Dipc = pyridine-2, 6-dicarboxylic acid) has been synthesized and characterized by IR, elemental analysis, and X-ray diffraction. Crystal data: orthorhombic system withspace group Pnna and unite cell parameters: a =2. 0645(3) nm, b = 1. 3484(2) nm, c =0. 8204(1) nm; V=2.2838(6) nm3, Z=4, Dca1d=1.726g@cm-3, μ=1.193mm-1, F(000)=1212, Gof=1.045, △ρ=339～ -348 e @ nm-3, the final R is 0. 0295. In the molecule of the complex, Co (Ⅱ) ion is six-coordinate to form a dis-torted octahedron. The N atom and the carboxyl group of pyridine-2, 6-dicarboxylic acid are coordinated with thecentral ions. One of the carboxyl groups of the pyridine-2, 6-dicarboxylic acid connect K (Ⅰ) and Co (Ⅱ). The com-pound possesses approximate C2 symmetry. The compounds form a three-dimensional network of infinite lengthconnection with crystal waters, potassium ions and hydrogen bonds. The result of kinetics of thermal decompositionindicated that the compound decomposition takes place in two steps.