A novel manganese(Ⅱ) coordination polymer [Mn(L~1)_2(H_2O)]·2H_2O (HL~1 = 2,6-dichlorobenzoic acid) 1 has been synthesized and structurally characterized. X-ray diffraction analyses reveal that 1 is a one-dimensional chain structure bridged by water molecules and 2,6-dichlorobenzoic acid. The crystal is of monoclinic, space group P2_1/c with a = 12.9701(19),b =20.592(3),c = 7.3759(10) (A),β = 102.660(2)°,V = 1.9221(5) nm~3,Z = 4,C_(14)H_(12)Cl_4MnO_7,M_r=488.98,D_c = 1.690 g/cm~3,μ = 1.275 mm~(-1),F(000) = 980,R_(int) = 0.0348,R = 0.0350,a...