Features of Formation of Mononuclear and Binuclear Copper(II) Complexes with 2,2'-Bipyridyl and closo-Decaborate Anion

Abstract

The copper(I) complexation reaction with 2,2'-bipyridyl in the presence of salts of the closo-deca-borate anion has been studied in air in organic solvents (1,2-dichloroethane and DMF). It has been found that, as a result of the redox reaction, copper(II) coordination compounds with the [B10H10]2– anion and 2,2'-bipy-ridyl anion are prepared from known copper(I) complex [ $${\text{Cu}}_{2}^{{\text{I}}}$$ (Bipy)2[B10H10]] formed in situ. It has been shown that the reaction conditions (the process temperature and solvent nature) have a significant effect on the reaction path and, accordingly, on the composition and structure of the resulting complexes. Mono- and binuclear Cu(II) complexes [CuII(Bipy)2Cl]2[B10H10] and {[ $${\text{Cu}}_{2}^{{{\text{II}}}}$$ (Bipy)2(μ-OH)2][B10H10]} have been isolated and chara-cterized. According to X-ray diffraction, the structure of complex {[ $${\text{Cu}}_{2}^{{{\text{II}}}}$$ (Bipy)2(μ-OH)2][B10H10]} contains long Cu…H(B) contacts between the closo-decaborate anion and the metal atom.