A new Co(II)polymer[Co(tdc)(1,4-bimb)]n1(H2tdc=thiophene-2,3-dicarboxylic acid,1,4-bimb=1,4-bis(imidazol-1-yl)butane)was synthesized under hydrothermal conditions.The compound crystallizes in the monoclinic system,space group C2/c with a=15.643(9),b=8.839(5),c=12.952(7),β=105.964(6)o,V=1721.8(16)3,Z=4,Mr=419.32,Dc=1.618Mg/m3,μ=1.149 mm-1,F(000)=860,the final R=0.0243 and wR=0.0613 for 1460 observed reflections with I>2σ(I).The compound presents a three-dimensional(3D)network extended by both tdc2-anions and 1,4-bimb ligands in which the tdc2-anions employ a chelating coordination mode.From the topology point of view,the structure could be described as a 3D 4-connected 65.8CdSO4-type net.Infrared spectroscopy,elemental analyses,thermogravimetric analysis and powder X-ray diffraction properties of 1 are also investigated. A new Co (II) polymer [Co (tdc) (1,4-bimb)] n1 (H2tdc = thiophene- 2,3- dicarboxylic acid, 1,4-bimb = ) butane was synthesized under the hydrothermal conditions. The compound crystallizes in the monoclinic system with space group C2 / c with a = 15.643 (9), b = 8.839 (5), c = 12.952 (7) the final R = 0.0243 and the wR = 0.0613 for 1460, respectively, with V = 1721.8 (16) 3, Z = 4, Mr = 419.32, Dc = 1.618 Mg / m 3, μ = 1.149 mm -1, F observed reflections with I> 2σ (I). The compound presents a three-dimensional (3D) network extended by both tdc2-anions and 1,4-bimb ligands in which the tdc2-anions employ a chelating coordination mode. of view, the structure could be described as a 3D 4-connected 65.8 CdS-type net. Infrared spectroscopy, elemental analyzes, thermogravimetric analysis and powder X-ray diffraction properties of 1 are also investigated.