A novel Mn(II) complex Mn-2(phen)(2)(p-MBA)(4)(H2O) has been hydrothermally synthesized by the reaction of p-methyl benzoic acid (p-MBA) with 1,10-phenanthroline (phen). Crystal data for this complex: monoclinic, space group C2/c, a = 2.3328(3), b =1.5549(2), c = 1.5557(2) nm, beta = 121.726(2)degrees, V = 4.7997(11) nm(3), M-r = 1028.85, D-c = 1.424 g/cm(3), Z = 4, F(000) = 2128, mu(MoKa) = 0.590mm(-1), GOOF = 1.060, R = 0.0333 and wR = 0.0767. In the crystal, each Mn(II) ion is coordinated by two nitrogen atoms from one o-phenanthroline molecule, three oxygen atoms from three p-methyl benzoi...