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How Repulsive Are Lone Pairs? A Rotational Barrier-Based Experimental Study.

Binzhou Lin1, Erik C Vik1, Xiaolong Huang1

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This summary is machine-generated.

Lone pair-lone pair repulsion in molecular rotors does not significantly increase rotational barriers. This study found no statistically significant difference compared to controls lacking such interactions, challenging conventional chemical assumptions.

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Area of Science:

  • Organic Chemistry
  • Computational Chemistry
  • Physical Chemistry

Background:

  • Lone pair-lone pair (lp-lp) repulsion is often assumed to destabilize molecular structures.
  • However, the quantitative impact of lp-lp repulsion is not well-defined in chemical literature.

Purpose of the Study:

  • To experimentally quantify the magnitude of lp-lp repulsion.
  • To compare rotational barriers in molecular rotors with and without through-space lp-lp interactions.

Main Methods:

  • Comparison of rotational barriers in two families of molecular rotors (rotor 1 with lp-lp proximity, rotor 2 as steric control).
  • Compilation of 23 rotational barriers per rotor from literature and new measurements.
  • Analysis of substituents with varied steric and electronic properties.

Main Results:

  • Rotors with through-space lp-lp interactions showed no statistically significant increase in rotational barrier height compared to steric controls.
  • The average difference in barrier height was less than 0.5 kcal/mol.
  • Results align with computational studies on lp-lp interactions.

Conclusions:

  • lp-lp repulsion does not appear to exert significant additional repulsive forces beyond electrostatics and steric effects.
  • Experimental findings challenge the conventional view of lp-lp repulsion as a major destabilizing factor.
  • Further research may refine understanding of non-bonding electron pair interactions.