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This study reveals attractive methyl-methyl interactions, where methyl groups act as both Lewis acids and bases. These interactions are weak, electrostatic, and show directional preferences in molecular structures.

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Area of Science:

  • Chemical bonding
  • Supramolecular chemistry
  • Computational chemistry

Background:

  • Methyl groups on electronegative atoms (N, O) act as Lewis acids in tetrel bonding.
  • Methyl groups on electropositive atoms (B, Al) can act as Lewis bases.
  • Understanding dual Lewis acid/base behavior is key to novel interactions.

Purpose of the Study:

  • To investigate attractive methyl-methyl interactions arising from dual Lewis acid/base behavior.
  • To find experimental evidence and analyze the nature of these interactions.
  • To explore the directionality and electronic contributions to methyl-methyl bonding.

Main Methods:

  • Exploration of the Cambridge Structural Database for experimental examples.
  • Density Functional Theory (DFT) calculations.
  • Natural Bond Orbital (NBO) analysis, Energy Decomposition Analysis (EDA), and Quantum Chemical Topology (QCT) analyses (QTAIM, NCI).

Main Results:

  • Experimental evidence of directional methyl-methyl interactions found in the Cambridge Structural Database.
  • Computational analysis confirms these interactions are weak yet attractive.
  • Electrostatics dominate, with significant contributions from charge transfer and polarization.

Conclusions:

  • Methyl-methyl interactions are a novel bonding phenomenon driven by complementary Lewis acid/base properties.
  • These interactions exhibit significant directionality, influencing molecular packing.
  • The findings contribute to understanding non-covalent interactions and molecular design.