Bis(1-carbamimidoyl-2-ethyl­isourea)copper(II) dinitrate

The copper(II) complex, [Cu(C4H10N4O)2](NO3)2 or [Cu(L 1e)2](NO3)2, where L 1e is 1-carbamimidoyl-2-ethyl­isourea, was obtained from a 1:2 molar ratio of copper(II) nitrate hemipenta­hydrate with 2-cyano­guanidine in ethanol. The crystal structure consists of the centrosymmetric [Cu(L 1e)2]2+ cation and two NO3 − counter-anions. The cation exhibits four-coordinate bonding of the two N,N-bidentate ligands and the CuII atom through the N-donor atoms, yielding a square-planar CuN4 geometry. Inter­molecular N—H⋯O hydrogen bonds link between the cation and and counter-anion, forming a two-dimentional layered structure extending parallel to (01)

Bis(1-carbamimidoyl-2-ethyl­isourea)copper(II) bis­(perchlorate)

The title complex, [Cu(C4H10N4O)2](ClO4)2 or [Cu(L 1e)2](ClO4)2, where L 1e is 1-carbamimidoyl-2-ethyl­isourea, was obtained from the ethano­lysis reaction of 2-cyano­guanidine and copper(II) perchlorate hexa­hydrate in a 2:1 molar ratio. The two bidentate L 1e ligands are coordinated to the CuII center through N-donor atoms, leading to the CuN4 chromophore. The CuII environment is slightly distorted square-planar, with a dihedral angle of 5.17 (6)° between the two six-membered chelate rings. One of the ClO4 − anions is disordered over two positions in a 0.6:0.4 ratio