Heteroligand zinc(II) and copper(II) complexes with naphthylacetic acid and monoethanolamine: Syntheses and crystal structures

Abstract

New heteroligand Cu(II) and Zn(II) complexes with the α-naphthylacetic acid anion (NAA) and monoethanolamine (MEA), [M(NAA)2(MEA)2] (M = Cu2+, (I), Zn2+ (II)), are synthesized. The crystal structures of the obtained complexes are determined by X-ray diffraction analysis (CIF files CCDC 984097 (I) and 930946 (II)). The crystals are monoclinic, for I: a = 18.8140(9) A, b = 4.82500(14) A, c = 16.0360(7) A, β = 115.135(6)°, V = 1317.87(11) A3, space group P21/c, Z = 2; for II: a = 32.9760(14) A, b = 5.0911(3) A, c = 15.7994(10) A, β = 94.418(5)°, V = 2644.6(3) A3, space group C2/c, Z = 4. In the structure of complex I, the Cu2+ ion arranged in the symmetry center is coordinated at the vertices of the distorted octahedron by the oxygen atoms of two NAA molecules (Cu-O(2) 2.019(4) A) and two MEA molecules. The latter is the bidentate-chelating ligand and coordinates the metal through the O and N atoms to form the five-membered metallocycle (Cu-O(3) 2.457(5), Cu-N(1) 1.986(5) A). In complex II, the Zn atom (on axis 2) is coordinated at the vertices of the distorted tetrahedron by the oxygen atoms of two NAA molecules (Zn-O(2) 1.976(4) A) and the nitrogen atoms of two MEA molecules (Zn-N 2.034(6) A). The character of the interaction of coordinated NAA and MEA ligands and methods for packing complexes I and II are considered on the basis of the structural data.