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Summary
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Geminal stability in alkanes, or protobranching, arises from a combined interaction of dispersion and exchange repulsion. This study quantifies these effects, revealing their role in reducing molecular strain and vibrational enthalpy.

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Area of Science:

  • Chemical Physics
  • Computational Chemistry
  • Quantum Chemistry

Background:

  • Noncovalent interactions are typically viewed as attractive (electrostatics, dispersion) or repulsive (exchange repulsion).
  • The origin of geminal stability in alkanes (protobranching) has been debated between these attractive and repulsive viewpoints.
  • Understanding these interactions is crucial for predicting molecular stability and reactivity.

Purpose of the Study:

  • To reframe geminal stability as a complementary interaction between dispersion and exchange repulsion.
  • To develop methods for visualizing and quantifying exchange repulsion and medium-range electron correlation.
  • To model the stability trends of octane isomers using computational chemistry.

Main Methods:

  • Utilized triplet hydrogen and argon dimers to develop density perturbation visualization.
  • Employed DFT-D3 correction to model medium-range dispersion potentials.
  • Calculated stability trends for eighteen octane isomers using various DFT functionals (BLYP, B3LYP, BP86, PBE, PBE0).

Main Results:

  • Developed a procedure to visualize and quantify exchange repulsion (ΔρSCF) and medium-range correlation (ΔΔρ).
  • Successfully reproduced dispersion potential shapes and modeled octane isomer stability trends.
  • Demonstrated that protobranching is linked to reduced steric repulsion and enhanced medium-range electron correlation.

Conclusions:

  • Geminal stability in alkanes is a result of a synergistic interaction between dispersion and exchange repulsion.
  • This complementary interaction leads to reduced vibrational enthalpy.
  • The findings provide a new perspective on noncovalent interactions and molecular stability.