One novel complex [Mn(C 10 H 9 O 3 ) 2 (4,4′-bipy)(H 2 O) 2 ] n with o-2-oxopropanoicbenic acid and 4,4′-bipy. has been synthesized and characterized. It crystallizes in the tetragonal space group P4 3 2 1 2, with a=1.626 0(3) nm, b = 1.6260(3) nm, c=2.1035(4) nm, V=5.56l 4(18) nm 3 , D c = 1.432 g·cm -3 , Z=8, F(000)=2 488. Final GooF=1.001, R 1 =0.0547, wR 2 =0.1109. The crystal structure shows that the manganese(II) ion is coordinated with two nitrogen atoms of two 4,4′-bipy molecules and two oxygen atoms from two o-2-oxopropanoicbenic a...