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pubmed-article:17048945pubmed:dateCreated2006-10-19lld:pubmed
pubmed-article:17048945pubmed:abstractTextMonte 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.lld:pubmed
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pubmed-article:17048945pubmed:authorpubmed-author:JorgensenWill...lld:pubmed
pubmed-article:17048945pubmed:authorpubmed-author:ThomasLaura...lld:pubmed
pubmed-article:17048945pubmed:authorpubmed-author:ChristakisThe...lld:pubmed
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pubmed-article:17048945pubmed:day26lld:pubmed
pubmed-article:17048945pubmed:volume110lld:pubmed
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pubmed-article:17048945pubmed:authorsCompleteYlld:pubmed
pubmed-article:17048945pubmed:pagination21198-204lld:pubmed
pubmed-article:17048945pubmed:dateRevised2007-12-3lld:pubmed
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pubmed-article:17048945pubmed:year2006lld:pubmed
pubmed-article:17048945pubmed:articleTitleConformation of alkanes in the gas phase and pure liquids.lld:pubmed
pubmed-article:17048945pubmed:affiliationDepartment of Chemistry, Yale University, 225 Prospect Street, New Haven, Connecticut 06520-8107, USA.lld:pubmed
pubmed-article:17048945pubmed:publicationTypeJournal Articlelld:pubmed
pubmed-article:17048945pubmed:publicationTypeResearch Support, U.S. Gov't, Non-P.H.S.lld:pubmed
pubmed-article:17048945pubmed:publicationTypeResearch Support, N.I.H., Extramurallld:pubmed
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