Bond strengths of ethylene and acetylene

Journal Article · Wed Jul 18 04:00:00 EDT 1990 · Journal of the American Chemical Society; (USA)

DOI:https://doi.org/10.1021/ja00171a013· OSTI ID:6636002

Ervin, K M; Gronert, S; Barlow, S E; Gilles, M K; Harrison, A G; Bierbaum, V M; DePuy, C H; Lineberger, W C; Ellison, G B ^[1]

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1. Univ. of Colorado, Boulder (USA) National Institute of Standards and Technology, Boulder, CO (USA)

Negative ion photoelectron spectroscopy and gas-phase proton transfer kinetics were employed to determine the CH bond dissociation energies of acetylene, ethylene, and vinyl radical: D{sub 0}(HCC-H) = 131.3 {plus minus} 0.7 kcal mol{sup {minus}1}, D{sub 0}(CH{sub 2}CH-H) = 109.7 {plus minus} 0.8 kcal mol{sup {minus}1}, and D{sub 0}(CH{sub 2}C-H) = 81.0 {plus minus} 3.5 kcal mol{sup {minus}1}. The strengths of each of the other CH and CC bonds in acetylene and ethylene and their fragments were derived. The energy required to isomerize acetylene to vinylidene was also determined: HC{triple bond}CH {yields} H{sub 2}C{double bond}C: {Delta}H{sub isom,0} = 47.4 {plus minus} 4.0 kcal mol{sup {minus}1}. As part of this study, proton transfer kinetics in a flowing afterglow/selected-ion flow tube apparatus were used to refine the acidities of ethylene, acetylene, and vinyl.

• DOE Contract Number: FG02-87ER13695
• OSTI ID: 6636002
• Journal Information: Journal of the American Chemical Society; (USA), Journal Name: Journal of the American Chemical Society; (USA) Vol. 112:15; ISSN 0002-7863; ISSN JACSA
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
ACETYLENE
ALKENES
ALKYNES
CHEMICAL BONDS
DATA
DATA ANALYSIS
DISSOCIATION ENERGY
ELECTRON SPECTROSCOPY
ENERGY
ETHYLENE
EXPERIMENTAL DATA
HYDROCARBONS
INFORMATION
KINETICS
MEASURING INSTRUMENTS
MEASURING METHODS
NUMERICAL DATA
ORGANIC COMPOUNDS
PHOTOELECTRON SPECTROSCOPY
SPECTROSCOPY