Cobalt(II) assembled complex compound, {[Co(CA)(bipym)](H2O)2}n(H2CA = chloranilie acid, bipym = 2,2′-bipyrimidine) (1) has been synthesized and structurally characterized by single-crystal X-ray diffraction. Compound1crystalizes in the monoclinic, space groupC2/c(#15), witha= 16.652(4) Å,b= 11.163(3) Å,c= 10.081(3) Å, β = 116.12(2)°,V= 1682.4(7) Å3,Z= 4. The bipym ligands bridge the cobalt centers in bis-bidentate fashion and make zigzag chains. The chains form layer structures by stacking interaction and hydrogen bonding interaction with the help of interstitial water molecules. The temperature dependence of the magnetic susceptibility of1shows intramolecular antiferromagnetic interaction with θ = - 39.7 K.