Lattice Dynamics through the Structural Phase Transition in d-Amphetamine Sulfate

详细信息    查看全文

• 作者：Iwona Olejniczak ; Katarzyna Pogorzelec-Glaser
• 刊名：The Journal of Physical Chemistry A
• 出版年：2012
• 出版时间：October 11, 2012
• 年：2012
• 卷：116
• 期：40
• 页码：9854-9862
• 全文大小：539K
• 年卷期：v.116,no.40(October 11, 2012)
• ISSN：1520-5215

文摘

The polarized infrared and Raman spectra of the single-crystalline d-amphetamine sulfate have been measured as a function of temperature in the vicinity of the structural phase transition. Infrared and Raman-active modes are identified and assigned. Significant signatures of the structural phase transition are observed in the temperature dependence of infrared modes both of the d-amphetamine unit and the sulfate anion. The changes reflect differences in the unit cell between low- and high-temperature phases of the d-amphetamine sulfate. Temperature dependence of the vibrational mode parameters displays pronounced hysteresis between 333 and 338 K that is extended over a smaller temperature range than 325鈥?45 K found in the earlier DSC study.