Journal
SPECTROSCOPY LETTERS
Volume 39, Issue 3, Pages 215-224Publisher
TAYLOR & FRANCIS INC
DOI: 10.1080/00387010600636916
Keywords
intermolecular forces; lattice phonons; pharmaceutical; terahertz spectroscopy; theophylline
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Funding
- Engineering and Physical Sciences Research Council [GR/R87086/02, GR/R87086/01] Funding Source: researchfish
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Time-domain terahertz (THz) spectroscopy has been used to characterize polymorphic transformations in polycrystalline theophylline, a widely used pharmaceutical compound. On transformation, different intermolecular bonding arrangements arise owing to changes in the lattice structure of the molecular crystal, leading to distinct THz spectral signatures. Temperature-dependent THz absorption measurements in anhydrous theophylline confirm that the observed vibrational modes originate from phonons within the crystal structure.
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