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Density functional theory studies on the reagent Ph3PBr2.

Stephen M Godfrey1, Alan Hinchliffe, Ahmed Mkadmh

  • 1School of Chemistry, University of Manchester, Sackville Street, Manchester M60 1QD, UK.

Dalton Transactions (Cambridge, England : 2003)
|April 27, 2005
PubMed
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Density functional theory investigated triphenylphosphine dibromide (Ph3PBr2) structures. The charge-transfer complex is most stable in gas phase but least stable in solution, impacting Ph3PBr2 reactivity.

Area of Science:

  • Computational Chemistry
  • Quantum Chemistry
  • Molecular Modeling

Background:

  • Triphenylphosphine dibromide (Ph3PBr2) is a reagent with complex structural possibilities.
  • Understanding its stable conformations is crucial for predicting its reactivity.

Purpose of the Study:

  • To computationally investigate the stationary points on the potential energy surface of Ph3PBr2.
  • To characterize the different structural minima and saddle points.
  • To evaluate the influence of basis set and solvent on the stability of Ph3PBr2 structures.

Main Methods:

  • Density functional theory (DFT) geometry optimizations using the B3LYP/6-311G(d,p) level of theory.
  • Characterization of four stationary points: three minima and one saddle point.
  • Single-point energy calculations with an augmented basis set (B3LYP/6-311+g(3d,2p)).

Related Experiment Videos

  • Modeling solvent effects using the Self-Consistent Reaction Field (SCRF) Onsager method for water, dichloroethane, and cyclohexane.

    • Main Results:

    • Identified three minima: conventional Ph3PBr2, an ion-pair [Ph3PBr]+Br-, and a charge-transfer complex.
    • Located a saddle point corresponding to a specific Br-P-Br and phenyl ring orientation.
    • The charge-transfer complex is the most stable structure in the gas phase.
    • In solution, the charge-transfer complex becomes the least stable structure.

    Conclusions:

    • The stability of Ph3PBr2 structures is highly dependent on the environment (gas phase vs. solution).
    • The charge-transfer complex, favored in the gas phase, is destabilized by polar solvents.
    • These findings are critical for understanding the reaction mechanisms and applications of Ph3PBr2.