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Issue 48, 2016
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Understanding the single-crystal-to-single-crystal solid-state phase transition of DL-methionine

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Abstract

The solid-state phase transition between the low temperature β and the high temperature α forms of DL-methionine was characterised in detail using DSC, SCXRD, thermal stage polarisation microscopy and solid-state NMR. The thermodynamic transition point of the α ↔ β transition of DL-methionine was determined to fall between 306 and 317 K. The transition is kinetically hindered, as is indicated by a large hysteresis. Moreover, the transition rate during cooling is significantly lower than during heating and there is a large temperature region of coexistence. The kinetic barriers involved are lower for single crystals than for powders. DL-Methionine crystals consist of 2D hydrogen-bonded bilayers interconnected by weak Van der Waals interactions. The crystals transform layer-wise, without complete delamination or deterioration, and with a transition front that propagates perpendicular to the layers and a relatively fast transition within one layer. The fast kinetics within the plane of the layers, combined with the faster kinetics in single crystals, indicate that cooperative motion could play a role in this single-crystal-to-single-crystal phase transition.

Graphical abstract: Understanding the single-crystal-to-single-crystal solid-state phase transition of dl-methionine

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Publication details

The article was received on 26 Sep 2016, accepted on 15 Nov 2016 and first published on 16 Nov 2016


Article type: Paper
DOI: 10.1039/C6CE02079H
Citation: CrystEngComm, 2016,18, 9363-9373
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    Understanding the single-crystal-to-single-crystal solid-state phase transition of DL-methionine

    M. M. H. Smets, S. J. T. Brugman, E. R. H. van Eck, P. Tinnemans, H. Meekes and H. M. Cuppen, CrystEngComm, 2016, 18, 9363
    DOI: 10.1039/C6CE02079H

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