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Phase change in tetraphenylphosphonium perchlorate
S R Batten1, A R Harris, K S Murray
1Department of Chemistry, PO Box 23, Monash University 3800, Australia. stuart.batten@sci.monash.edu.au
Acta Crystallographica. Section C, Crystal Structure Communications
|November 15, 2000
Summary
The title compound, a triphenylphosphine perchlorate salt, exhibits a reversible phase transition around 173-180 K. This transition involves the ordering of perchlorate anions within the crystal structure.
Area of Science:
- Solid-state chemistry
- Crystallography
- Materials science
Background:
- Triphenylphosphine perchlorate (C(24)H(20)P(+).ClO(4)(-)) is a molecular salt with potential applications in materials science.
- Understanding phase transitions in such compounds is crucial for predicting and controlling their properties.
Purpose of the Study:
- To investigate the phase transition behavior of triphenylphosphine perchlorate.
- To elucidate the structural changes associated with the observed phase transition.
Main Methods:
- Single-crystal X-ray diffraction at variable temperatures.
- Differential scanning calorimetry (DSC) to detect thermal events.
Main Results:
- A sudden, reversible phase change was observed in the temperature range of 173-180 K.
- The phase transition is characterized by the ordering of approximately 75% of the perchlorate anions.
Conclusions:
- Triphenylphosphine perchlorate undergoes a distinct solid-state phase transition driven by anion ordering.
- This finding provides insights into the structure-property relationships of molecular salts and their potential for temperature-dependent applications.