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Polymorphism in a secondary phosphine.

Mo Liu1, Keith Izod1, Paul G Waddell1

  • 1School of Natural and Environmental Sciences, Bedson Building, Newcastle University, Newcastle upon Tyne, NE1 7RU, United Kingdom.

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|February 5, 2025
PubMed
Summary
This summary is machine-generated.

Polymorphism, the existence of multiple crystal structures, was discovered in secondary phosphines (R2PH) for the first time. This study reveals how crystal packing influences molecular conformation and steric hindrance in bis(2,3,5,6-tetramethylphenyl)phosphine.

Keywords:
Me...π interactionscrystal packingcrystal structurepolymorphismsecondary phosphinesteric pressure

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Area of Science:

  • Crystallography
  • Solid-state chemistry
  • Organophosphorus chemistry

Background:

  • Polymorphism is common in organic compounds but rarely documented in secondary phosphines.
  • Understanding crystal packing is crucial for predicting and controlling solid-state properties.

Purpose of the Study:

  • To report the first instance of polymorphism in a secondary phosphine.
  • To investigate the influence of crystal packing on molecular conformation and steric hindrance.
  • To characterize the supramolecular structures of the observed polymorphs.

Main Methods:

  • Single-crystal X-ray diffraction was used to determine the crystal structures of two polymorphs.
  • Analysis of molecular conformation, packing arrangements, and intermolecular interactions.

Main Results:

  • Two distinct crystal structures (polymorphs) of bis(2,3,5,6-tetramethylphenyl)phosphine were identified.
  • The polymorphs exhibit different molecular conformations and supramolecular arrangements (columns vs. layers).
  • Weak Me...π interactions were observed in polymorph II, correlating with variations in C-P-C bond angles.

Conclusions:

  • This study establishes polymorphism in secondary phosphines.
  • Crystal packing significantly impacts the steric environment around the phosphorus atom.
  • Supramolecular interactions, though weak, play a role in structural variations.