Crystal structures of (1,4,7,10-tetra­aza­cyclo­dodecane-κ(4) N)bis­(tri­cyano­methanido-κN)nickel and (1,4,7,10-tetra­aza­cyclo­dodecane-κ(4) N)(tri­cyano­methanido-κN)copper tri­cyano­methanide

The structures of two mononuclear transition-metal complexes with tri­cyano­methanide (tcm(−)) and 1,4,7,10-tetra­aza­cyclo­dodecane (cyclen) ligands, [Ni(C(4)N(3))(2)(C(8)H(20)N(4))], (I), and [Cu(C(4)N(3))(C(8)H(20)N(4))](C(4)N(3)), (II), are reported. In the neutral complex (I), the nickel cation is coordinated by one cyclen ligand and two monodentate N-bound tcm(−) anions in a distorted octa­hedral geometry. The tcm(−) ligands are mutually cis. The Cu(II) atom in (II) displays a distorted tetra­gonal–pyramidal geometry, with the four N-donor atoms of the cyclen ligand in the equatorial plane, and one tcm(−) anion bound through a single N atom in an axial site, forming a monocation. The second tcm(−) molecule acts as a counter-ion not directly coordinating to the copper cation. In both (I) and (II), extensive series of N—H⋯N and C—H⋯N hydrogen bonds generate three-dimensional network structures.