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Related Experiment Videos

Solid-state 31P CP/MAS NMR vs. solution study of bis(tertiary phosphines)

G Szalontai1, J Bakos, S Aime

  • 1University of Veszprém, Hungary.

Solid State Nuclear Magnetic Resonance
|October 1, 1993
PubMed
Summary

Solid-state 31P NMR reveals distinct phosphorus atom environments in diphosphines. Flexible diphosphines show single resonance, while less flexible and chiral variants exhibit non-equivalent phosphorus atoms in the solid state.

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Area of Science:

  • Solid-state NMR Spectroscopy
  • Organophosphorus Chemistry

Background:

  • Diphosphines are crucial ligands in organometallic chemistry and catalysis.
  • Understanding the structural and electronic properties of diphosphines in different phases is essential.

Purpose of the Study:

  • To compare solid-state 31P{1H} Cross-Polarization Magic-Angle Spinning (CP/MAS) NMR data with solution-phase data for various diphosphines.
  • To investigate the non-equivalence of phosphorus (P) atoms in the solid state and its correlation with molecular flexibility and chirality.

Main Methods:

  • Solid-state 31P{1H} CP/MAS NMR spectroscopy was employed.
  • Solution-state 31P NMR spectroscopy was used for comparison.
  • Analysis of chemical shifts and spin systems (e.g., AB system) was performed.

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Main Results:

  • Less flexible diphosphines, including chiral ones, showed non-equivalent P atoms in the solid state.
  • Flexible diphosphines with linear alkyl chains (e.g., 1,2-ethane, 1,4-butane derivatives) exhibited a single P resonance.
  • Contradictory data for bis(diphenylphosphino)methane were resolved, confirming an AB spin system (two distinct P atoms) in the solid state.
  • Chiral diphosphines displayed significant P atom chemical shift differences in the solid state, not observed in solution.

Conclusions:

  • Molecular flexibility significantly influences phosphorus atom equivalence in solid-state diphosphines.
  • Chirality and restricted rotation in diphosphines lead to observable P atom non-equivalence in the solid state.
  • Anisotropic effects from phenyl rings are proposed as a key factor for the observed chemical shift differences in chiral diphosphines.