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Related Experiment Video

Updated: May 2, 2026

Preparation and Reactivity of a Triphosphenium Bromide Salt: A Convenient and Stable Source of PhosphorusI
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Polymorphism of triphenyl phosphite.

J Baran1, N A Davydova2, M Drozd1

  • 1Institute of Low Temperature and Structure Research, PAS, 50-950 Wroclaw, Poland.

The Journal of Chemical Physics
|March 18, 2014
PubMed
Summary

Triphenyl phosphite (TPP) exhibits polymorphism, with a newly discovered crystalline phase. This new polymorph melts at 291.6 K, distinct from the known phase melting at 299.1 K.

Area of Science:

  • Materials Science
  • Crystallography
  • Physical Chemistry

Background:

  • Triphenyl phosphite (TPP) is a glass-forming liquid.
  • TPP has garnered interest due to potential polyamorphism (multiple amorphous phases).
  • Polymorphism, the existence of different crystalline structures, is also a key area of investigation.

Purpose of the Study:

  • To provide experimental evidence for the existence of polymorphism in triphenyl phosphite (TPP).
  • To characterize a newly identified polymorphic phase of TPP.

Main Methods:

  • Experimental investigation of TPP's phase behavior.
  • Controlled cooling and heating protocols to induce crystallization.
  • Differential Scanning Calorimetry (DSC) or similar thermal analysis to determine melting points.

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Main Results:

  • Experimental evidence confirms the existence of polymorphism in TPP.
  • A new polymorphic crystalline phase of TPP was successfully obtained.
  • The new polymorph crystallizes upon heating to 270 K after specific cooling and holding procedures.
  • This new polymorph exhibits a distinct melting point of 291.6 K, lower than the conventional phase (299.1 K).

Conclusions:

  • Triphenyl phosphite (TPP) exhibits polymorphism, not just polyamorphism.
  • A second crystalline form of TPP has been experimentally verified.
  • The discovery of this new polymorph expands the understanding of TPP's solid-state behavior.