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The title complex, [Co2(bpdc)2(bim)4]n(bpdc=biphenyl-2,2'-dicarboxylate dianion, bim=benzimidazole), was synthesized in a aqueous solution and its crystal structure was determined by means of X-ray diffraction. There are two different coordinated Co(Ⅱ) centers in the complex. The Co1 center has a deformed trigonal-bipyramidal geometry, while the Co2 center possesses a tetrahedral geometry. In addition, the two different coordination modes of bpdc ligands act as two kinds of bridges to link Co1 and Co2, resulting in a catena chain.