P. Upadhya, K. L. Nguyen, Yaochun Shen, J. Obradovic, K. Fukushige, R. Griffiths, L. Gladden, A. Davies, E. Linfield
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Transformation-induced evolution of far-infrared vibrational modes in theophylline
Time-resolved terahertz (THz) spectroscopy has been used to characterize polymorphic transformations in crystalline theophylline, a widely used pharmaceutical compound. On transformation, different inter-molecular bonding arrangements arise, leading to distinct THz spectral signals. Changes between polymorphic forms were confirmed by IR and powder X-ray diffraction measurements.
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