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Title: On the heats of formation of methylketene, dimethylketene and related cations
Authors: Nguyen, Minh Tho ×
Nguyen, HMT #
Issue Date: 1999
Publisher: ELSEVIER SCIENCE BV
Series Title: Chemical Physics Letters vol:300 issue:3-4 pages:346-350
Conference: date:Univ Louvain, Dept Chem, B-3001 Louvain, Belgium; Vietnam Natl Univ, Coll Educ, Hanoi, Vietnam
Abstract: Ab initio MO and DFT calculations up to the CCSD(T)/6-311+ + G(3df, 2p) level have been applied to the disagreement between theory and experiment concerning the standard enthalpies of formation of methylketene and dimethylketene. Our results confirm previous theoretical (G2) values, as well as the experimental proton affinities and ionization energies of both alkylketenes. A set of consistent values for Delta H(f, 298)degrees are estimated as follow (kJ mol(-1)): CH3CH = C = O: -68; CH3CH = C = O.+: 795; CH3CH2C = O+: 618; (CH3)(2)C = C = O: -92; (CH3)(2)C = C = O.+: 723 and (CH3)(2)CHC = O+: 583. The proton affinities (kJ mol(-1)) are: PA(methylketene) = 842 and PA(dimethylketene) = 855. The persistent disagreement between the theoretical and experimental values appears to arise from an overestimation of the experimental heats of formation of CH3CH2C = O+, CH3CH = C = O.+ and (CH3)(2)C = C = O.+. (C) 1999 Elsevier Science B.V, All rights reserved.
ISSN: 0009-2614
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Quantum Chemistry and Physical Chemistry Section
× corresponding author
# (joint) last author

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