[μ-2,8-Dimethyl-5,11-bis(dimethyl­amino­ethyl)-1,4,5,6,7,10,11,12-octahydro­diimidazo[4,5-h;4,5-c][1,6]diazecine]bis[aqua­copper(II)] diacetate hexahydrate

In the title compound, [Cu₂(C₂H₃O₂)₂(C₂₀H₃₆N₈)(H₂O)₂](C₂H₃O₂)₂·6H₂O, the dinuclear cation has inversion symmetry and contains square-pyramidal Cu^II ions separated by 7.471 (1) Å. Symmetry-related cations are linked to a framework of rings of five water molecules, where each water molecule acts as both a single hydrogen-bond donor and acceptor, an arrangement very close to that believed to exist in liquid water.

4,4'-(2-Methyl-1H-imidazole-4,5-diyl)bis[2(S)-methyl-3-azoniabutanoate] acetic acid monohydrate

In the title compound, C₁₂H₂₀N₄O₄·C₂H₄O₂·H₂O, the main fragment contains two L-alanine residues with a zwitterionic structure. The crystal structure is characterized by a two-dimensional network of O—H...O, O—H...N and N—H...O hydrogen bonds.

[μ-5,11-Bis­(dimethyl­ethyleneamino)-2,8-dimeth­yl-1,4,5,6,7,10,11,12-octa­hydro­imidazo[4,5-h]imidazo[4,5-c][1,6]diazecine]bis­[aqua­sulfatocopper(II)] hexa­hydrate: a dinuclear copper sulfate complex based on a diazecine ligand

In the title compound, [Cu₂(SO₄)₂(C₂₀H₃₆N₈)(H₂O)₂]·6H₂O, the dinuclear molecule lies across an inversion centre and contains square-pyramidal Cu^II ions separated by 7.5709 (18) Å. Symmetry-related molecules are linked together by hydrogen bonds between the coordinated water mol­ecules and the sulfate ligands. They are further linked by a framework of fused cyclic water tetra­meric and pseudo-hexa­gonal units in a three-dimensional hydrogen-bonded network involving both coordinated and uncoordinated water mol­ecules, as well as sulfate ligands. While the tetra­meric units are purely composed of water mol­ecules, the pseudo-hexa­gonal units involve O atoms from the sulfate. Further hydrogen bonding also involves the NH group from the imidazole in addition to the above-mentioned units.