Abstract
The anisotropy of thermal deformations in seven studied chiral crystal structures is attributed to the different numbers and organizations of intermolecular contacts.
Highlights
In the published literature, there are many works concerning studies of phase relations in organic systems by means of temperature-resolved powder X-ray diffraction (TRPXRD)
Results of TRPXRD investigations demonstrated that L-Val, L-Ile, and V2I do not undergo any solid phase transformations,[37] which is supported by the temperatureresolved diffraction patterns shown in Electronic supplementary information (ESI):† Fig. S8A–C
The calculated parameters of the thermal deformation tensor and thermal expansion coefficients of the monoclinic cell parameters of Val and Ile are given in Table 3; the figures of the thermal expansion coefficients of the related crystal structures are shown in Fig. 5A and B, respectively
Summary
There are many works concerning studies of phase relations in organic systems by means of temperature-resolved powder X-ray diffraction (TRPXRD). With regard to thermal expansion or thermal deformations in crystal structures, such studies are predominately considered for inorganic systems, including minerals.[1,2,3,4,5,6,7]. This article presents results of studying thermal deformations in crystal structures of discrete phases in two chiral systems, namely, (S)-malic acid–(R)-malic acid and L-valine–Lisoleucine, using temperature-resolved PXRD. In the first system, composed of the malic acid enantiomers, nonequimolar 1 : 3 and 3 : 1 discrete compounds as well as three. The present work is a continuation of our previous research on these chiral systems.[32,33,34,35]
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