Synthesis of the first fluoro(phosphanyl)- and diphosphanyl-stannanes and surprising formation of [P(SnMe3)4]+ SiF5-.
Monophosphanylation of the difluorostannane Is2SnF2 (Is = 2,4,6-triisopropylphenyl) with Si(PH2)4 furnishes the first isolable fluoro(phosphanyl)stannane Is2Sn(F)PH2 1, which readily undergoes unique SiO2-assisted decompostion to [Is2Sn(PH)]2 2 and HF, while further phosphanylation of 1 leads to the remarkably stable diphosphanylstannane Is2Sn(PH2)2 3; the latter reacts with Me3SnF at the glass-wall to give the first perstannylphosphonium pentafluorosilicate [P(SnMe3)4]+ SiF5- 4.
Heavier group 14 complexes with anionic P-donor ligands
Abstract The heavier group 14 elements Ge, Sn and Pb form a wide array of complexes with anionic P-donor ligands. This review surveys the synthesis, structures and, where pertinent, reactions of this class of compound; while the review is intended to be comprehensive in its coverage, emphasis is placed on the literature since 2000. For the purposes of the review ligands are classified according to the location of the negative charge: i.e. localized at phosphorus (e.g. (di)organophosphides, organophosphinidenes), localized on an atom adjacent to phosphorus (e.g. phosphinomethanides), or remote from the phosphorus center (e.g. tertiary phosphine functionalized alkoxides). These compounds adopt an impressive diversity of structures in the solid state and frequently exhibit unusual dynamic behavior in solution.
Numerical Simulation of Thermal Sensitivity for Explosives
In order to compare the thermal sensitivity of several typical explosives, this article solved numerically one-dimensional transient heat conduction equation including thermal decomposition for explosives with finite difference method. The explicit difference equations under different boundary conditions were established, and the corresponding stability criterion was derived. The ignition times for typical explosives were calculated, which was used to evaluate thermal sensitivity of explosives.