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Effects of Temperature on Free Energy02:11

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The spontaneity of a process depends upon the temperature of the system. Phase transitions, for example, will proceed spontaneously in one direction or the other depending upon the temperature of the substance in question. Likewise, some chemical reactions can also exhibit temperature-dependent spontaneities. To illustrate this concept, the equation relating free energy change to the enthalpy and entropy changes for the process is considered:
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At room temperature, the chair conformer of cyclohexane undergoes rapid ring flipping between two equivalent chair conformers at a rate of approximately 105 times per second. These two chair conformers are in equilibrium. The rapid ring flipping results in the interconversion of the axial proton to an equatorial proton and an equatorial to the axial proton. Such interconversions are too rapid and cannot be detected on the NMR timescale. Hence, the NMR spectrometer cannot distinguish between the...
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How Molecular Conformational Changes Affect Changes in Free Energy.

Mazen Ahmad1, Volkhard Helms2, Thomas Lengauer1

  • 1Department for Computational Biology and Applied Algorithmics, Max Planck Institute for Informatics , Campus E1 4, 66123 Saarbrücken, Germany.

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Summary
This summary is machine-generated.

This study presents a quantitative link between molecular conformational changes and free energy. Dissipative entropy, related to conformational changes, is key to understanding free energy in biochemical reactions.

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Area of Science:

  • Computational Chemistry
  • Biophysical Chemistry
  • Chemical Physics

Background:

  • Free energy calculations are crucial for understanding molecular behavior.
  • Molecular conformational changes significantly influence system thermodynamics.
  • Quantifying the entropic contribution of conformational changes remains challenging.

Purpose of the Study:

  • To establish a simple quantitative relationship between molecular conformational changes and free energy changes.
  • To identify and quantify the role of dissipative entropy in free energy calculations.
  • To provide a framework for better understanding conformational dynamics in biochemical processes.

Main Methods:

  • Development of a quantitative relationship linking molecular conformation and free energy.
  • Identification of dissipative entropy as a key component of free energy change.
  • Equating dissipative entropy to relative entropy between initial and final conformational states.

Main Results:

  • A direct quantitative relationship between molecular conformational changes and free energy is established.
  • Dissipative entropy, derived from conformational changes, is shown to be a major contributor to free energy.
  • The calculation of dissipative entropy is identified as the primary challenge in free energy computations.

Conclusions:

  • The proposed framework simplifies the understanding of free energy changes driven by molecular conformations.
  • Decomposition of dissipative entropy offers insights into the role of conformational dynamics in biochemical reactions.
  • This approach enhances the predictive power of computational methods in biophysics and chemistry.