Abstract
Heat capacities of crystallineβ-cyclodextrin undecahydrate have been measured in the temperature range between 13 and 300K by use of a miniaturized adiabatic low-temperature calorimeter. A first-order phase transition occurred at 226K with a discontinuous entropy change of 45.0 ± 1.0J K −1 mol−1. The highly disordered nature of the high temperature phase was considered in relation to the entropy contribution. A glass transition phenomenon observed around 150K was ascribed to the freezing of a configurational change of the protons engaged in the four-membered hydrogen-bonded ring which appeared only in the low temperature phase.
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Hanabata, H., Matsuo, T. & Suga, H. Calorimetric study ofβ-cyclodextrin undecahydrate. Journal of Inclusion Phenomena 5, 325–333 (1987). https://doi.org/10.1007/BF00665365
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DOI: https://doi.org/10.1007/BF00665365