Quantifying Solid-State Mixtures of Crystalline Indomethacin by Raman Spectroscopy Comparison with Thermal Analysis

Table 1

The alpha and gamma indomethacin-specific Raman and IR peaks and their bond assignments used in our study [21].

Polymorphic form	Raman peak (cm^−1)/peak assignment	IR peak (cm^−1)/peak assignment
Alpha	1648 hydrogen bonded acid (C=O) stretch	1649 hydrogen bonded acid (C=O)
	1680 hydrogen bonded acid (C=O)	1681 hydrogen bonded acid (C=O)
	1692 benzoyl (C=O)	1688 benzoyl (C=O)
		1733 nonhydrogen bonded acid (C=O)
Gamma	1698, Benzoyl (C=O)	1717 asymmetric acid (C=O) of a cyclic dimer; 1698 benzoyl (C=O)