Crystal structures of a family of layered coordination polymers containing divalent metal ions (Mn2+, Co2+, Ni2+ and Zn2+) and the 3-amino 4-methyl benzoate ion

The syntheses and crystal structures of the layered coordination polymers M(C8H8NO2)(2) [M = Mn (1), Co (2), Ni (3) and Zn (4)] are described. These isostructural compounds contain centrosymmetric trans-MN2O4 octahedra as parts of infinite sheets; the ligand bonds to three adjacent metal ions in mu(3)-N,O,O' mode from both its carboxylate O atoms and its amine N atom. In each case, weak intra-sheet N-Ha <-O and C-Ha <-O hydrogen bonds may help to consolidate the structure. Crystal data: 1, C16H16MnN2O4, M (r) = 355.25, monoclinic, P2(1)/c (No. 14), a = 10.6534(2) , b = 4.3990(1) , c = 15.5733(5) , beta = 95.1827(10)A degrees, V = 726.85(3) (3), Z = 2, R(F) = 0.026, wR(F (2)) = 0.067. 2, C16H16CoN2O4, M (r) = 359.24, monoclinic, P2(1)/c (No. 14), a = 10.6131(10) , b = 4.3374(4) , c = 15.3556(17) , beta = 95.473(4)A degrees, V = 703.65(12) (3), Z = 2, R(F) = 0.041, wR(F (2)) = 0.091. 3, C16H16N2NiO4, M (r) = 359.02, monoclinic, P2(1)/c (No. 14), a = 10.6374(4) , b = 4.2964(2) , c = 15.2827(8) , beta = 95.9744(14)A degrees, V = 694.66(6) (3), Z = 2, R(F) = 0.028, wR(F (2)) = 0.070. 4, C16H16N2O4Zn, M (r) = 365.68, monoclinic, P2(1)/c (No. 14), a = 10.6385(5) , b = 4.2967(3) , c = 15.2844(8) , beta = 95.941(3)A degrees, V = 694.89(7) (3), Z = 2, R(F) = 0.038, wR(F (2)) = 0.107.