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Area of Science:

  • Organic Chemistry
  • Supramolecular Chemistry
  • Chemical Crystallography

Background:

  • The 1,2-Me,Ph substitution pattern in organic molecules involves specific spatial arrangements between methyl and phenyl groups.
  • Non-covalent interactions, such as CH/π bonding, play a crucial role in determining molecular conformation and properties.

Purpose of the Study:

  • To investigate the formation and impact of CH/π bonds in organic compounds with 1,2-Me,Ph substitution.
  • To analyze the relationship between torsion angles and the presence of CH/π interactions in various molecular structures.

Main Methods:

  • Utilized the Cambridge Structural Database (CSD) to search for specific substructures (Me-C═C-Ph, Me-C-C-Ph, Me-C-N-Ph) with 1,2-Me,Ph substitution.
  • Analyzed torsion angles (C(Me)-C-C-C(i)) to correlate with C(Me)-C(o) and C(Me)-C(i) distances.
  • Supported findings with computational calculations.

Main Results:

  • Observed that methyl groups form CH/π bonds with ortho carbon atoms of phenyl rings, leading to phenyl ring tilting.
  • Found that CH/π interactions occur for torsion angles up to 80°, shortening C(Me)-C(o) distances below van der Waals limits.
  • Determined that torsion angles greater than 80° prevent CH/π interactions due to elongated C(Me)-C(i) and C(Me)-C(o) distances.

Conclusions:

  • The 1,2-Me,Ph substitution motif significantly influences molecular conformation through CH/π bonding.
  • Torsion angles are critical determinants of CH/π interaction occurrence and strength in these systems.
  • The study provides insights into the geometric consequences of non-covalent interactions in organic molecules.