A one-dimensional chain cobalt(II) coordination polymer with 2,4,6-trimethylbenzoic acid, 4,4'-bipyridine and cobalt perchlorate anhydrous has been synthesized and characterized in the mixture solvent of water and alcohol. Crystal data for this complex: monoclinic, space 3 group C2/c, a = 2.3805(8), b = 1.1464(4), c = 1.5807(5) nm, gamma = 128.435(4)degrees, V = 3.3791(18) nm(3), D-c = 1.246 g/cm(3), Z = 4, F(000) = 1340, final GooF = 1.009, R = 0.0504 and wR = 0.1287. Structural analysis shows that the cobalt ion is coordinated with two nitrogen atoms of one 4,4'-bipyridine molecule and four ...