A novel one-dimensional chain coordination polymer [Mn(NAA)_2(4,4'-bipy)(H_2O)_4]n has been synthesized with α-naphthaleneacetic acid, 4,4?-bipy and manganese(II) sulfate as raw materials. Crystal data for this complex: monoclinic, space group P2_1/c, a = 1.1421(2), b = 1.6337(3), c = 0.94177(19) nm, β = 112.15(3)o, V = 1.6275(6) nm~3, D_c = 1.407 g/cm~3, Z = 2, μ(MoKα) = 0.467 mm-1, F(000) = 722, S = 1.007, R = 0.0412 and wR = 0.1022. The crystal structure shows that two neighboring manganese(II) ions are linked together by one 4,4?-bipy m...