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Lattice dynamics through the structural phase transition in D-amphetamine sulfate.

Iwona Olejniczak¹, Katarzyna Pogorzelec-Glaser

¹Institute of Molecular Physics, Polish Academy of Sciences, Smoluchowskiego 17, 60-179 Poznań, Poland. olejniczak@ifmpan.poznan.pl

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|September 18, 2012

Summary

Polarized infrared and Raman spectroscopy revealed distinct changes in D-amphetamine sulfate

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Area of Science:

Solid-state chemistry
Vibrational spectroscopy
Crystallography

Background:

D-amphetamine sulfate undergoes a structural phase transition.
Understanding this transition is crucial for its material properties.

Purpose of the Study:

To investigate the structural phase transition of single-crystalline D-amphetamine sulfate using polarized infrared and Raman spectroscopy.
To identify and assign infrared and Raman-active modes and their temperature dependence.

Main Methods:

Polarized infrared and Raman spectroscopy.
Temperature-dependent spectral analysis.
Crystallographic analysis of unit cell changes.

Main Results:

Observed significant signatures of the phase transition in infrared modes of both D-amphetamine and sulfate ions.
Identified changes in unit cell structures between low- and high-temperature phases.
Detected pronounced hysteresis in vibrational mode parameters between 333-338 K, narrower than previously reported.

Conclusions:

Vibrational spectroscopy effectively probes the structural phase transition in D-amphetamine sulfate.
The observed hysteresis provides insights into the dynamics of the phase transition.
The findings offer a detailed understanding of the temperature-dependent structural changes.