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.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
