A new manganese coordination polymer 1, [Mn(H_2O)_4(L)]_n(ClO_4)_(2n).2nH_2O.3nL (L= 2,5-bis(4-pyridyl)-3,4-diaza-2,4-hexadiene), has been synthesized and structurally characterized.The crystal structure was determined by single-crystal X-ray diffraction. The crystal is of monoclinic, space group Pn with a = 13.9176(8), b = 15.4754(9), c = 15.9670(9) (A), β =99.5010(10)°, V = 3391.8(3) (A)~3, Z = 2, C_(56)H_(68)Cl_2MnN_(16)O_(14), M_r= 1315.10, D_c = 1.288 g/cm~3, μ =0.344 mm~(-1), F(000) = 1374, R = 0.0733 and wR = 0.2035. In the crystal th...