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Related Experiment Videos

Adjacent gauche stabilization in linear alkanes: implications for polymer models and conformational analysis.

Jeffery B Klauda, Richard W Pastor, Bernard R Brooks

    The Journal of Physical Chemistry. B
    |July 21, 2006
    PubMed
    Summary

    High-level quantum mechanics reveals new insights into alkane conformations. Adjacent gauche states of the same sign offer surprising stabilization, impacting molecular modeling and force field development.

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    Area of Science:

    • Computational chemistry
    • Quantum mechanics
    • Molecular modeling

    Background:

    • Investigating the conformational energies of n-alkanes from n-pentane to n-decane using high-level ab initio quantum mechanical calculations.
    • Examining the "pentane effect" (destabilizing adjacent gauche states of opposite sign) and its dependence on alkane chain length.

    Discussion:

    • Quantifying the energetic cost of adjacent gauche states of the same sign, finding it to be approximately half the energy of a single gauche state.
    • Highlighting the significant stabilization provided by adjacent gauche states of the same sign, a factor often overlooked in current models.

    Key Insights:

    • The "pentane effect" in alkanes is confirmed, with minor variations based on chain length.
    • Adjacent gauche states of the same sign exhibit a stabilizing effect, requiring only 0.22-0.37 kcal/mol.

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  • This stabilization phenomenon necessitates re-evaluation of existing rotational isomeric models and force fields.

    • Outlook:

    • Incorporate adjacent gauche stabilization into rotational isomeric models for greater accuracy.
    • Refine conformational analysis methodologies for alkanes, lipids, and polymers.
    • Develop advanced force fields that account for these nuanced conformational behaviors.