Browsing by Author "Gordon, John E."

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    Adiabatic Calorimetry of Organic Salts: Tetra-n-hexylammonium Perchlorate
    (Journal of the Chemical Society : Faraday Transaction - I. The Chemical Society, London. 1973, 69 (3), 1973) Andrews, John T. S.; Gordon, John E.
    We have measured the heat capacity of a zone refined sample of tetra-n-hexylammonium perchlorate (99.94 % pure, by analysis of the fusion curve). Values of the transition temperatures, enthalpies and entropies are: fusion 379.18 K, 16 350 J mol-1, 43.10 J K-1 mol-1; transition (1) 367.51, 2658, 7.24; transition (2) 355.91, 5839, 16.42; transition (3) 333.57, 22 990, 68.93. We interpret fusion and transition (3) as being due, respectively, to ionic melting (break down of the lattice) and “ melting ” of the hexyl groups. Transitions (1) and (2) are explained by re-orientation of the perchlorate anions.