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Sublimation pressures of tetraphenylmethane and associated bond energies
Affiliation:1. Laboratory of Optical Materials and Structures, Institute of Semiconductor Physics, SB RAS, Novosibirsk 630090, Russia;2. Functional Electronics Laboratory, Tomsk State University, Tomsk 634050, Russia;3. Laboratory of Semiconductor and Dielectric Materials, Novosibirsk State University, Novosibirsk 630090, Russia;4. Laboratory of Crystal Chemistry, Institute of Inorganic Chemistry, SB RAS, Novosibirsk 630090, Russia;5. Laboratory of Nanodiagnostics and Nanolithography, Institute of Semiconductor Physics, SB RAS, Novosibirsk 630090, Russia;6. Laboratory of Crystal Growth, Institute of Geology and Mineralogy, SB RAS, Novosibirsk 630090, Russia;7. Geology and Mineralogy Department, Novosibirsk State University, Novosibirsk 630090, Russia;8. Spintronics Laboratory, Saint Petersburg State University, Saint Petersburg 198504, Russia;9. Laboratory of Research Methods of Composition and Structure of Functional Materials, Novosibirsk State University, Novosibirsk 630090, Russia;1. Department of Chemistry, Lomonosov Moscow State University, Leninskie Gory 1-3, GSP-1, 119991 Moscow, Russian Federation;2. N.S. Kurnakov Institute of General and Inorganic Chemistry of Russian Academy of Sciences, Leninskii pr. 31, 119991 Moscow, Russian Federation;1. Department of Chemistry, Lomonosov Moscow State University, Leninskie Gory 1-3, GSP-1, 119991 Moscow, Russian Federation;2. N.S. Kurnakov Institute of General and Inorganic Chemistry, RAS, Leninsky pr. 31, GSP-1, 119991 Moscow, Russian Federation;3. Center for Emerging Energy Technologies, University of New Mexico, Albuquerque, NM 87131-1070, USA
Abstract:The sublimation pressures of tetraphenylmethane in the temperature range 396 to 466 K have been determined from the simultaneous measurements of the torsional recoil and the rate of mass effusion. The enthalpy and entropy of sublimation derived from the least-squares analyses of the results are (33.65 ± 0.60)kcalthmol−1 and (56 ± 2)calthK−1mol−1 respectively. The average bond dissociation energy 〈D〉(CPh) is calculated to be (99.2 ± 1.5)kcalthmol−1. Estimates of the bond dissociation energies for the stepwise dissociation processes of CPh4 are presented.
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