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- W2094307050 abstract "The present paper focuses on the high temperature form I of caffeine and on its low temperature metastable form. Structural, dynamic, and kinetic information has been obtained by X-ray, dielectric, and calorimetric investigations. This study shows the following features: (1) The high temperature phase (I) of caffeine is in a state of dynamically orientationally disordered crystalline state (so-called “plastic, or rotator, phase”). (2) This high-symmetry hexagonal phase can be maintained at low temperature in a metastable situation. (3) Under deep undercooling of form I a glass transition occurs in the disordered crystalline state near room temperature. It is associated with the orientational freezing in of the molecular motions. Otherwise stated, the metastable state I enters into a nonergodic unstable state, so-called “glassy crystal” state. These findings rationalize the difficulties seen with caffeine in pharmaceutical science." @default.
- W2094307050 created "2016-06-24" @default.
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- W2094307050 date "2005-07-30" @default.
- W2094307050 modified "2023-10-13" @default.
- W2094307050 title "Plastic and Glassy Crystal States of Caffeine" @default.
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- W2094307050 doi "https://doi.org/10.1021/jp040494c" @default.
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