(5,16-Dimethyl-2,6,13,17-tetra­azatricyclo­[14,4,01,18,07,12]docosane-κ4 N)dinitratocopper(II) trihydrate.

In the title compound, [Cu(NO3)2(C20H40N4)]·3H2O, the Cu atom lies on a crystallographic inversion centre and has a distorted octahedral geometry, with four N atoms of the macrocyclic ligand in the equatorial positions and two O atoms of the axial nitrate ligands. The long axial Cu—O bond of 2.746 (2) Å may result from the Jahn-Teller effect. The macrocyclic ligand adopts the most stable trans-III configuration with the two six-membered rings in chair form and two five-membered rings in a gauche form. [ABSTRACT FROM AUTHOR]