Chlorido-(2-{(2-hy-droxy-eth-yl)[tris-(hy-droxy-meth-yl)meth-yl]amino}-ethano-lato-κ 5 N , O , O ', O '', O ''')copper(II).

The title complex, [Cu(C 8 H 18 NO 5 )Cl] or [Cu(H 4 bis-tris-)Cl], was obtained starting from the previously reported [Cu(H 5 bis-tris-)Cl]Cl compound. The deprotonation of the amino-polyol ligand H 5 bis-tris {[bis-(2-hy-droxy-eth-yl)amino]-tris-(hy-droxy-meth-yl)methane, C 8 H 19 NO 5 } promotes the formation of a very strong O-H⋯O inter-molecular hydrogen bond, characterized by an H⋯O separation of 1.553 (19) Å and an O-H⋯O angle of 178 (4)°. The remaining hy-droxy groups are also engaged in hydrogen bonds, forming R 2 2 (8), R 4 4 (16), R 4 4 (20) and R 4 4 (22) ring motifs, which stabilize the triperiodic supra-molecular network.