The title complex has been synthesized with p-acetamidobenzoic acid and 1,10-phenanthroline (phen) in the solvent mixture of water and methanol. It crystallizes (C40H42MnN4O6, Mr =729.72) in monoclinic space group P21/c with a= 1.362 77(17) nm, b=1.8823(2) nm, c=1.252 53(16) nm; β= 114.500(2)°, V =2.923 6(6) nm3, Dc = 1.449 g·cm-3, Z=4, F(000) = 1 320, R1=0.041 4, wR2=0.087 8. The crystal structure shows that the zinc atom is coordinated with three oxygen atoms from two p-acetamidobenzoic acids molecules and one water molecule respectively, ...