HEAT CAPACITY OF TETRAMETHYLAMMONIUM TRICHLOROMANGANATE(II) FROM 1.5 TO 300K

BY ANTHONY G DUNN, MICHAEL JEWESS, LIONEL A K STAVELEY, AND RICHARD D WORSWICK

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This work was performed in the Inorganic Chemistry Laboratory, University of Oxford, UK, and was published in J. Chem. Thermodynamics.

Abstract

The heat capacity of tetramethylammonium trichloromanganate(II), N(CH₃)₄MnCl₃, from 1.5 to 300 K is reported. The principal novelty of the results is in the region above 52 K, for which only a very small-scale plot has previously been published. From our results we estimate the anomalous molar entropy gain associated with the monoclinic-to-hexagonal transition (T_λ = 126 K) as R ln 2.8.

Keywords: thermodynamics, crystallography, disorder, orientational disorder, specific heat, heat capacity, anomaly, TMMC, tetramethylammonium, trichloromanganate(II).

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