Tetrakis(2,2′-bipyridine)-1κ4N,N′;4κ4N,N′-{μ4-N,N′-bis[3-(2-oxidoethylamino)propyl]oxamidato(4−)-1:2:3:4κO:κ3N,N′,O′:κ3O′′,N′′,N′′′:κO′′′}tetracopper(II) tetrakis(perchlorate)

Abstract

The title complex, [Cu(4)(C(12)H(22)N(4)O(4))(C(10)H(8)N(2))(4)](ClO(4))(4), has a novel tetranuclear copper(II) cation with the oxamidate and ethanolate groups of a trans tetraanion of N,N'-bis[3-(hydroxyethylamino)propyl]oxamide (H(4)heap) as bridges. The Cu...Cu separation through the oxamide group is 5.1592 (15) A, while those through the two ethanolate bridges are 3.3845 (13) and 3.3392 (13) A. The two central copper(II) ions are in square-planar N(2)O(2) environments, while the two terminal copper(II) ions have distorted N(4)O square-pyramidal geometries. The heap(4-) ligand, with an iminoalcohol form, has both an oxamide and two ethanolate bridges. Two of the four perchlorate anions are disordered and have long contacts with the square-planar Cu(II) ions. The three-dimensional structure features arene-perchlorate C-H...O hydrogen bonds and pi-pi stacking.