Boron cluster anions B_(10)H_(10)~(2-) and B_(10)H_(11)~- in complexation reactions of copper(I). Positional isomers of the complex [Cu2(9Nphen)4B_(10)H_(10)]

摘要

The complexation reactions of Cu~I with the B_(10)H_(10)~(2-) anion and its protonated form, the B_(10)H_(11)~- anion, were studied in the presence of phenanthridine (9Nphen). Depending on the reaction conditions, positional isomers of the monomeric copper(I) complex [Cu2(9Nphen)4B_(10)H_(10)] were selectively isolated. The closo-decaborate anion in the complexes is coordinated to the Cu(I) atoms through the apical edges 1-2, 7(8)-10 or 1-2, 1-4 via the formation of multicenter CuHB bonds. The crystal structures and IR spectra of the complexes were studied. The compound [Cu2(9Nphen)4B_(10)H_(10)] is the first monomeric complex isolated in the form of the 1-2, 7(8)-10 isomer. It extends the series of positional isomers, which we have described earlier.