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

The copper(I) complexation reaction with 2,2'-bipyridyl in the presence of salts of the closo-decaborate 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'-bipyridyl anion are prepared from known copper(I) complex [Cu-2(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 [Cu-II(Bipy)(2)Cl](2)[B10H10] and {[Cu-2(II)(Bipy)(2)(mu-OH)(2)][B10H10]} have been isolated and characterized. According to X-ray diffraction, the structure of complex {[Cu-2(II)(Bipy)(2)(mu-OH)(2)][B10H10]} contains long Cu center dot center dot center dot H(B) contacts between the closo-decaborate anion and the metal atom.