Synthetic, structural and spectroscopic studies of copper(II) complexes derived from the combination of the succinamate(-1) ligand with aromatic N,N′-chelates

The use of succinamic acid (H(2)sucm)/N,N'-chelate (2,2'-bipyridine, bpy; 4,4'-dimethyl-2,2'-bipyridine, dmbpy; 1,10-phenanthroline, phen) 'ligand blends' in CuX2 center dot yH(2)O (X = NO3, y = 3; X = Cl, y = 0) chemistry has yielded the new complexes [Cu-2(Hsucm)(3)(bpy)(2)](NO3)center dot 0.5MeOH (1 center dot 0.5MeOH), [Cu-2(Hsucm)(OH)Cl(bpy)(2)](OH)center dot 3.6H(2)O (5 center dot 3.6H(2)O) and [Cu-2(Hsucm)(2)Cl-2(phen)(2)] (6). The succinamate(-1) ion behaves as a carboxylate ligand and exists in two different coordination modes in the structures of the above complexes, i.e., the common syn, syn mu(2)-kappa O:kappa O' in 1, 5 and 6, and the mu(2)-kappa O-2:kappa O' in 1. The primary amide group of Hsucm(-) remains uncoordinated and participates in intermolecular hydrogen bonding interactions leading to 1D, 2D and 3D networks. Characteristic IR bands of the complexes are discussed in terms of the known structures and the coordination modes of the Hsucm(-) ligands. (C) 2009 Elsevier Ltd. All rights reserved.