Standard enthalpy of formation of hexamethyldisilane
- 1 January 1991
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in Journal of the Chemical Society, Faraday Transactions
- Vol. 87 (6) , 841-845
- https://doi.org/10.1039/ft9918700841
Abstract
The standard (p°= 0.1 MPa) enthalpy of formation at 298.15 K of liquid hexamethyldisilane was determined by measuring the enthalpy of its reaction with bromine to produce trimethylsilicon bromide. The required ΔfH°m[(CH3)3SiBr, I]/kJ mol–1=–330.4 ± 2.7 was determined from its enthalpy of hydrolysis in aqueous hydrobromic acid. The final result, ΔfH°m[(CH3)6Si2, I]/kJ mol–1=–341.1 ± 5.5 differs considerably from previous determinations and the consequences for the thermochemistry of silicon–methyl species are discussed. In particular the enthalpies of formation of the silylenes, SiH2, SiHMe and SiMe2, were derived as 266, 201 and 140 kJ mol–1, respectively, with uncertainties < ±6 kJ mol–1.Keywords
This publication has 27 references indexed in Scilit:
- Polysilane high polymersChemical Reviews, 1989
- Certainties and uncertainties in the heats of formation of the methylsilylenesOrganometallics, 1989
- Kinetic determinations of the heats of formation of methylated disilanes and of silylene, methylsilylene and dimethylsilyleneOrganometallics, 1989
- The UV absorption spectrum of trimethylsilyl radical in the gas phaseChemical Physics Letters, 1986
- Kinetics of the gas-phase reaction between iodine and trimethylsilane and the bond dissociation energy D(Me3Si—H). Part 2Journal of the Chemical Society, Faraday Transactions 1: Physical Chemistry in Condensed Phases, 1979
- Kinetics of the gas-phase reaction between iodine and trichlorosilane and the bond dissociation energy D(Cl3Si—H)Journal of the Chemical Society, Faraday Transactions 1: Physical Chemistry in Condensed Phases, 1976
- Mechanism of thermolysis of hexamethyldisilane and the silicon–silicon bond dissociation energyJournal of the Chemical Society, Faraday Transactions 1: Physical Chemistry in Condensed Phases, 1975
- Bonding studies of organometallic compounds of boron and the group IV elements. Part VII. Enthalpies of formation of hexamethyldisiloxane, hexamethyldisilane, and tetraethylsilane by rotating bomb calorimetryJ. Chem. Soc. A, 1971
- THE HEATS OF FORMATION OF SOME UNSTABLE GASEOUS HYDRIDES1The Journal of Physical Chemistry, 1961
- On the Phase Transition of HexamethyldisilaneBulletin of the Chemical Society of Japan, 1959