Photoreactions of Sc3N@Ih-C80 and Lu3N@Ih-C80 with disilirane: Isolation and characterization of labile 1,2-adducts

Abstract

The photolysis of Sc3N@Ih-C80 with disilirane (1,2-disilacyclopropane) afforded the corresponding 1,2- and 1,4-adducts. The relatively unstable 1,2-product was characterized using spectroscopic and electrochemical analyses, and theoretical calculations. The relative energies of the optimized structures are consistent with the experimentally observed isomerization of the 1,2-adduct to the 1,4-adduct. The electron-donating effects of the silyl groups in these products were confirmed by comparing the redox potentials of the related Sc3N@Ih-C80 derivatives. The relative stabilities and electronic properties of the 1,2- and 1,4-adducts of Lu3N@Ih-C80 show similar aspects to those obtained for the corresponding Sc3N@Ih-C80 derivatives.