N,N-Dimethylcarbamato-Komplexe von Kupfer und Zink

N,N -Dimethylcarbamato Complexes of Copper and Zinc Reactions of the 1 : 1 adduct of dimethylamine and carbon dioxide (dimcarb) with metallic copper and zinc, respectively, are reported. Dimcarb gives with copper in the presence of oxygen the N,N-dimethylcarbamato copper(II) complex [Cu(O₂CNMe₂)₂(HNMe₂)₂] ( 1 ). Zinc spontaneously dissolves in a dimcarb-acetonitrile mixture under generation of hydrogen and giving (H₂NMe₂)[Zn₂(O₂CNMe₂)₅] · MeCN ( 3 ). The rate of this reaction is strongly depending on the purity of the metal, high purity zinc doesn't react. But 3 can be prepared from it by electrosynthesis. The crystal structures of 1 and 3 were determined by X-ray analysis. In 1 the copper atom has a distorted octahedral coordination sphere in which the two carbamate ligands are chelating. In the homoleptic complex anion of 3 two zinc atoms are bridged by three carbamate ligands whereas the other two carbamate ligands are coordinated monodentately.