Properties and preparations of Si-Si linkages

Characterization of Shock-Sensitive Deposits from the Hydrolysis of Hexachlorodisilane

“…The most likely source of the gas is hydrogen, as indicated by Hengge, which is evolved from the hydrolyzed deposit with caustic alkalis. 8 In fact, the alkaline attack has been used as a mean for determining Si–Si contents based on the volume of the hydrogen gas evolved. The corresponding mechanism is proposed as follows 9 …”

“…The fire ball that was not present in the inert environment suggests that there is a flammable gas/vapor release upon ignition. The most likely source of the gas is hydrogen, as indicated by Hengge, which is evolved from the hydrolyzed deposit with caustic alkalis . In fact, the alkaline attack has been used as a mean for determining Si–Si contents based on the volume of the hydrogen gas evolved.…”

“…Earlier literature concerning the Si–Si linkages has been presented in an extensive summary by Hengge . The Si–Si bonds are said to be very sensitive to oxidation as the Si–O–Si bonding is thermodynamically strongly favored.…”

“…Earlier literature concerning the Si−Si linkages has been presented in an extensive summary by Hengge. 8 The Si−Si bonds are said to be very sensitive to oxidation as the Si−O−Si bonding is thermodynamically strongly favored. Acid hydrolysis occurs to give polymeric compounds retaining Si−Si bonds; alkaline hydrolysis yields silicic acid with the disruption of the Si−Si bonding.…”

The crystal and molecular structure of octaphenylcyclotetrasilane, C48H40Si4

“…Octaphenylcyclotetrasilane (OPHCTSI)readily undergoes ring-opening, ring-fragmentation and ringextension reactions; thus it serves as a starting material for the synthesis of five-and six-membered polysilanes, heteropolysilanes, halogenated silanes, etc. (Hengge, 1974). The title compound is of interest because the only cyclotetrasilane structure known hitherto is that of tetra-tert-butyltetramethylcyclotetrasilane, hereinafter TBMSI (Hurt, Calabrese & West, 1975) which possesses a non-planar four-membered ring with a mean Si-Si bond length of 2.377 A.…”