A Manganese(II) polymer {[Mn(bpdc)(bipy)(H2O)]·4.5H 2O}n has been synthesized (bpdc=2,2-bipyridine-3,3- dicarboxylate,bipy=4,4-bipyridine) and characterized by IR, UV, elemental analysis and X-ray crystal structure determination. It crystallizes in Monoclinic system, space group P2/n with a=1.010 13(8) nm, b=1.164 66(9) nm, c=2.147 40(16) nm, β=98.2220(10)°, V=2.500 4(3) nm3, Z=4, Dc=1.467 g·cm-3, F(000)=1 144, R1=0.049 0, wR2=0.141 2. The crystal structure shows that the Mn2+ ions have octahedral coordination geometry with two coordination...