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 (H2sucm)/N,N′-chelate (2,2′-bipyridine, bpy; 4,4′-dimethyl-2,2′-bipyridine, dmbpy; 1,10-phenanthroline, phen) ‘ligand blends’ in CuX2·yH2O (X = NO3, y = 3; X = Cl, y = 0) chemistry has yielded the new complexes [Cu2(Hsucm)3(bpy)2](NO3)·0.5MeOH (1·0.5MeOH), [Cu2(Hsucm)(OH)Cl(bpy)2](OH)·3.6H2O (5·3.6H2O) and [Cu2(Hsucm)2Cl2(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 μ2-κO:κO′ in 1, 5 and 6, and the μ2-κ2O:κO′ 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.

Graphical abstractThe use of succinamic acid (H2sucm) in CuX2·yH2O (X− = NO3-, y = 3; X− = Cl−, y = 0)/N,N′-donor (bpy, phen, dmbpy) reaction mixtures yields dinuclear complexes and 1D coordination polymers. The coordinative versatility of the succinamate(−1) ligand is reflected on the three different ligation modes observed, while its hydrogen bonding ability gives rise to interesting 1D, 2D and 3D supramolecular structures.Figure optionsDownload full-size imageDownload as PowerPoint slide