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Open AccessArticle

Does Thermosalient Effect Have to Concur with a Polymorphic Phase Transition? The Case of Methscopolamine Bromide

1
Department of Physics, Faculty of Science, University of Zagreb, 10000 Zagreb, Croatia
2
Ruđer Bošković Institute, Bijenička 54, 10000 Zagreb, Croatia
3
Department of Earth and Environmental Sciences, University of Pavia, 27100 Pavia, Italy
*
Author to whom correspondence should be addressed.
Crystals 2018, 8(7), 301; https://doi.org/10.3390/cryst8070301
Received: 14 June 2018 / Revised: 16 July 2018 / Accepted: 19 July 2018 / Published: 21 July 2018
(This article belongs to the Special Issue Rietveld Refinement in the Characterization of Crystalline Materials)
In this paper, we report for the first time an observed thermosalient effect that is not accompanied with a phase transition. Our experiments found that methscolopamine bromide—a compound chemically very similar to another thermosalient material, oxitropium bromide—exhibited crystal jumps during heating in the temperature range of 323–340 K. The same behavior was observed during cooling at a slightly lower temperature range of 313–303 K. Unlike other thermosalient solids reported so far, no phase transition was observed in this system. However, similar to other thermosalient materials, methscolopamine showed unusually large and anisotropic thermal expansion coefficients. This indicates that the thermosalient effect in this compound is caused by a different mechanism compared to all other reported materials, where it is governed by sharp and rapid phase transition. By contrast, thermosalient effect seems to be a continuous process in methscolopamine bromide. View Full-Text
Keywords: thermosalient materials; jumping crystals; scopolamine bromide; negative thermal expansion; HT-XRPD thermosalient materials; jumping crystals; scopolamine bromide; negative thermal expansion; HT-XRPD
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Klaser, T.; Popović, J.; Fernandes, J.A.; Tarantino, S.C.; Zema, M.; Skoko, Ž. Does Thermosalient Effect Have to Concur with a Polymorphic Phase Transition? The Case of Methscopolamine Bromide. Crystals 2018, 8, 301.

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