The first representatives of the radical anions of silatranes XSi(OCH2CH2)3N – organic derivatives of the pentacoordinate silicon atom (X = Ph, 1; p-NO2PhO, 2a; m-NO2PhO, 2b; o-NO2PhO, 2c) – were obtained and characterized by EPR spectroscopy. The structure of 1(−˙), 2a(−˙), 2b(−˙), and 2c(−˙) in polar solvents (C-PCM and COSMO models) was studied at the UMP2 and UB3PW91 levels of theory. The v...

that every single material derived from silicon chemistry seems extremely modern. Silicon occurs naturally in sand and rocks, generally in the form of silica and silicate, and is the second most abundant element on earth after oxygen. Only crystalline silicon and the silanes and organosiloxanes are truly modern products: they do not occur freely in nature, but are entirely the product of human ...

Novel trisilasumanenes that have no substituents on the exo carbon atoms, silicon analogues of sumanene, were prepared via repetitive lithiations of triphenylene followed by introduction of silicon functionalities. The optical properties of these trisilasumanenes and their related compounds were investigated by UV-vis and fluorescence spectroscopy.