CRYSTAL STRUCTURE OF {AQUAIMIDAZOLE-[2-(2-carbamoylhydrazone)-propionato]}COPPER(II) NITRATE
Yu. M. Chumakov1, V. I. Tsapkov2, E. Jeanneau3, A. P. Gulea2
1Institute of Applied Physics, Academy of Sciences of Moldov, Chisinau
2Moldova State University, Chisinau
vtsapkov@gmail.com
3Claude Bernard University, Lyon, France
Keywords: 3d metal complexes, X-ray crystallographic analysis, semicarbazone of pyruvic acid, imidazole
Abstract
The crystal structure of {aquaimidazole[2-(2-carbamoylhydrazone)-propionato]}copper(II) nitrate [Cu(L)Im(H2O)]NO3 (I), where HL is the semicarbazone of pyruvic acid, Im is imidazole, is dtermined. The crystal structure of I contains two independent complexes IА and IВ in which copper atoms coordinate once deprotonated tridentate НL, imidazole, and water molecules. Outer spheres of the complexes contain nitrate ions. In the compounds studied the coordination polyhedron of the copper atom is a distorted tetragonal pyramid. Its base is composed of carboxyl and carbamide oxygen atoms, azomethine nitrogen of monodeprotonated HL molecules, and the imidazole nitrogen atom. In the crystal, nitrate ions and imidazole molecules link the complexes via hydrogen bonds into 2D networks parallel to the (010) plane. These networks in turn are in pairs arranged into layers along the [010] direction due to hydrogen bonds between water molecules and oxygen atoms of nitrate ions, and also by water molecules and O3 atoms of the neighboring 2D networks. In the crystal, the π–π stacking interaction is observed between the imidazole rings from different layers and there is also a N–O⋯Cg (π ring) interaction inside the layers.
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