One novel binucear manganese(II) complex Mn2(phen)2 ·(o-ABA)4 · (H2O)2 with o-acetamidobenzoic acid (o-ABA) and 1,10-phenanthroline (phen) has been synthesized and characterized. Crystal data for this complex: monoclinic, space group P21/c, a=0.80226(16) nm, b=2.6186(5) nm, c=1.281 6(3) nm, β=95.83(3)°, V=2.678 5(9) nm3, Dc=1.511 g·cm-3, D=2, F(000) = 1 260, Final GooF=1.084, R 1=0.057 8, wR2=0.118 9. The crystal structure shows that two neighboring manganese (II) ions are linked together by two bridging o-acetamidobenzoic acid, forming a ...