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In the last decade, several stablesilicon compounds with nonclassicalinverted geometry around silicon atoms have been synthesized. Their unusual structures, bonding, and reactivity have been investigated extensively by X-ray analysis, spectroscopy, and theoretical calculations. In thishighlight review, recent progress on chemistry of silicon compounds with inverted geometry around silicon atoms is summarized. [ABSTRACT FROM AUTHOR]

Ferrocenyl-substituted bicyclo[1.1.1]pentasilanes 1, 2, and 3 were synthesized by the reactions of bromo-substituted bicyclo[1.1.1]pentasilanes with lithioferrocene. Significant interactions between bicyclo[1.1.1]pentasilane and ferrocenyl units were suggested by cyclic voltammetry, UV-vis absorption spectrum, and theoretical calculations. [ABSTRACT FROM AUTHOR]

A new carbon family with a prism structure has been found by quantum chemical calculations. The prism-C20 has a D10h structure with double-layered decagonal rings connected each other by ten vertical CC bonds. The CC bond lengths are 0.144 nm on the decagonal rings and 0.148 nm on the side faces. The diameter of the ring is 0.465 nm. The prism-C20 is expected to be stable, since the lowest energy barrier from it was estimated to be 158.0 kJ mo1-1. [ABSTRACT FROM AUTHOR]

Reaction of stable phosphinyl radical 1a with AZADO gave aminoxyphosphine 3 as the primary product by selective radical coupling at -40 °C. Compound 3 decomposed to phosphorane 4, silyl phosphinate 5, and aminophosphine 6 at room temperature. The molecular structures of 4-6 were determined by X-ray structural analysis. The homolytic N-O bond cleavage of 3 and the subsequent silyl migration of the resulting phosphinoyl radical 7 would be key steps in the reaction. [ABSTRACT FROM AUTHOR]

Two-coordinate dialkylsilylene-coinage metal complexes 3+-TPFPB- (Cu) and 4+·TPFPB (Ag) were synthesized as the first dialkylsilylene-copper complex and the first silylene-silver complex, respectively, by the reaction of dialkylsilylene 1 with the corresponding metal borate. X-ray analysis showed that both the complexes adopted a linear structure with two perpendicular dialkylsilylene units. Theoretical study indicated that weak π back-donation of the copper and silver complexes compared to that of the corresponding isoelectronic neutral palladium complex would be due to low-lying d orbitals of Cu+ and Ag+ centers and responsible for the linear structures. [ABSTRACT FROM AUTHOR]