Conformation of alkanes in the gas phase and pure liquids.

Conformation of alkanes in the gas phase and pure liquids. Research Abstract Details 

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Conformation of alkanes in the gas phase and pure liquids. Abstract Text:

Laura L Thomas,Theodore J Christakis,William L Jorgensen,

Monte Carlo (MC) statistical mechanics simulations have been carried out for the homologous alkane series of n-butane through n-dodecane in the gas phase and for the pure liquids at 298 K and 1 atm using the OPLS-AA force field. The study addresses potential cumulative deviations of computed properties and potential conformational differences between the gas phase and pure liquids, for example, from self-solvation in the gas phase. The average errors in comparison with experimental data for the computed densities and heats of vaporization are modest at 0.7% and 6.9%, respectively. Also, the invariant gas and liquid-phase results for average end-to-end distances and percentages of trans conformations for each nonterminal C-C bond assert that the conformer populations are not altered upon transfer from the gas phase to the pure liquid for the n-alkanes in this size range. Average end-to-end distances were also computed from the results of conformational searches and corroborated the MC findings. Quantitatively, the OPLS-AA result for the trans population of the C3-C4 bond in n-undecane is in close agreement with the findings from (13)C NMR experiments. Finally, previous work on determining the shortest n-alkane that does not have an all-trans global energy minimum has been extended. The smallest n-alkane with a hairpin geometry that is lower in energy than the all-trans conformer occurs for C(22)H(46) with OPLS-AA, though with a correction for GG sequences, the true turning point is likely in the C(16)-C(18) range.

Conformation of alkanes in the gas phase and pure liquids. Publishing Authors By Initials

LL Thomas,TJ Christakis,WL Jorgensen,

For similar natural sciences: chemistry: chemistry, physical: phase transition research abstracts see: natural sciences: chemistry: chemistry, physical: phase transition research

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Conformation of alkanes in the gas phase and pure liquids. Journal Published:

PUBLICATION TYPE: Research Support, U.S. Gov't,

Journal: The journal of physical chemistry. B

VOLUME: 110

Page Numbers: 21198-204

Journal Abbreviation:

ISSN: 1520-6106

DAY: 26

MONTH: Oct

YEAR: 2006

Conformation of alkanes in the gas phase and pure liquids. Information

Number of References:

LANGUAGE: eng

NlmUniqueID: 101157530

Conformation of alkanes in the gas phase and pure liquids. Keywords Mesh Terms:

KEYWORDS: Phase Transition

MESH TERMS: chemistry

Chemical & Substance for Abstract: Conformation of alkanes in the gas phase and pure liquids. Information

Substance Name: Gases

Registry Number: 0

Grant and Affiliation Information for Conformation of alkanes in the gas phase and pure liquids.

AFFILIATION: Department of Chemistry, Yale University, 225 Prospect Street, New Haven, Connecticut 06520-8107, USA.

Country: United States

AGENCY: United States NIGMS

GRANT: GM032136

ACRONYM: GM

MEDLINETA: J Phys Chem B

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