Synthesis and the crystal structure of diaqua[N,N-di(2-carboxyethyl)-o-anisidinato]nickel(II) trihydrate, [Ni(o-andp)(H2O)(2)] center dot 3H(2)O

The complex [Ni(o-Andp)(H2O)(2)] (.) 3H(2)O, where H-2[o-Andp] is o-anisidi ne-N,N-di-3-propionic acid, was synthesized, and its structure was establis hed by X-ray diffraction analysis. The complex crystallizes in the triclini c system, space group P (1) over bar a = 12.023(2) Angstrom, b = 12.398(2) Angstrom, c = 13.576(2) Angstrom, alpha = 91.46(l)', beta = 112.13(1)degree s, gamma = 104.38(1)degrees, V = 1799.8(5) Angstrom (3), Z = 4, R = 0.0553 for 6272 reflections with I greater than or equal to 2 sigma (I). The asymm etric unit contains two crystallographical ly independent complexes with si milar structures. The distorted octahedral coordination about the Ni atom i s formed by two O atoms of the propionate groups (the average Ni-O distance is 2.007 Angstrom) located in trans positions with respect to one another, the O atom of the methoxy group (the average Ni-OCH3 distance is 2.163 Ang strom), and the N atom of the tetradentate o-Andp(2-) ligand (the average N i-N distance is 2.087 Angstrom). The coordination polyhedron of the Ni atom is completed with two O atoms of the water molecules (the average Ni-OH2 d istance is 2.053 Angstrom).