Spectral Characteristics and Structures of Metal Complexes with 3-Hydroxy-4,6-dinitro-2-ethoxypyridine: Crystal and Molecular Structures of Di(3-hydroxy-4,6-dinitro-2-ethoxypyridinato)diaquacopper(II)

摘要

Seven complexes of manganese(II), copper(II), cadmium, silver(I), samarium(III), and praseody-mium(III) with 3-hydroxy-4,6-dinitro-2-ethoxypyridine (HL) were isolated in the crystalline state and studied by IR and UV spectroscopy. The molecular and crystal structures of di(3-hydroxy-4,6-dinitro-2-ethoxypyridi-nato)diaquacopper(II) [CuL_2(H_2O)_2] were determined. The coordination mode of the organic ligand L~- is bidentate chelating through the O(2) oxygen atoms of the hydroxy group and the O( 1) atom of the ethoxy group. The coordination polyhedron of the copper atom is a prolate tetragonal bipyramid (4 + 2) with two O(l) atoms in the axial positions (Cu-O( 1) 2.413 A) and two O(2) atoms of the two L~- ligands and the O(7) atoms of the water molecules in the equatorial plane (Cu-O(2), 1.912 A; Cu-O(7), 1.972 A).