The phase characterisation and morphologies of forms I and II of terephthalic acid are presented. The structural nature of the II → I polymorphic phase transition has been explored and form II shown to be more stable at room temperature and pressure. A new mechanism is proposed for the apparent stability of multiply twinned samples of form I.
R. J. Davey, S. J. Maginn, S. J. Andrews, S. N. Black, A. M. Buckley, D. Cottier, P. Dempsey, R. Plowman, J. E. Rout, D. R. Stanley and A. Taylor, J. Chem. Soc., Faraday Trans., 1994, 90, 1003 DOI: 10.1039/FT9949001003
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