Tetraaquatetrakis[2-(2-hydroxyethylamino)ethanolato]tetracopper(II) tetranitrate 14/3-hydrate

Abstract

The structure of the title complex, [Cu4(C4H10NO2)4(H2O)4](NO3)4·14/3 H2O, consists of tetranuclear [Cu4(Hdea)4(H2O)4]4+ cations (H2dea is diethano­lamine), uncoordinated nitrate anions and water mol­ecules. Each copper centre in the two independent cations (one on a twofold rotation axis and the other with \overline 4 crystallographic symmetry) is similarly coordinated by two alkoxo O atoms, one amine N atom of the monodeprotonated Hdea ligands and one O atom from a water mol­ecule in a square-planar geometry [Cu—O/N bond lengths are in the range 1.939 (6)–2.045 (8) A]. The two axial positions of the Cu atoms are occupied by a weakly bound ethanol group of the chelating Hdea ligand and an alkoxo O atom from a neighbouring Hdea ligand [average Cu—O = 2.532 (7) A]. The coordination geometry of the Cu atoms can, therefore, be best described as distorted elongated octahedral. The intermolecular hydrogen bonds that involve OH and NH groups of the ligands, uncoordinated NO3− anions and water mol­ecules reinforce the crystal structure by forming an extended three-dimensional network.