Browsing by Author "Loots, Leigh"

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    Facile synthesis of a C4-symmetrical inherently chiral calix[4]arene†
    (Royal Society of Chemistry, 2021-09) Hodson, Luke; Visagie, Kevin J.; Smith, Michael-Phillip; Loots, Leigh; Kuter, David; Snayer, Tregen M.
    Inherently chiral calix[4]arenes with C4-symmetry are extremely rare and difficult to synthesise, severely hampering any effort to expand on their potential as chiral supramolecular catalysts and building blocks. Herein we report a reaction of a tetracarbamate calix[4]arene with NBS which results in a high yield of an inherently chiral calix[4]arenes with C4-symmetry. Furthermore, employing a chiral N-Boc proline moiety allows for separation of the diastereomers formed, thus obtaining the pure enantiomers after hydrolysis. The enantiomers could be assigned based on the CD spectra and DFT calculated values.
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    Tuning extreme anisotropic thermal expansion in 1D coordination polymers through metal selection and solid solutions†
    (Royal Society of Chemistry, 2021-07) Van Wyk, Lisa M.; Loots, Leigh; Barbour, Leonard J.
    The thermal expansion behaviour of a series of 1D coordination polymers has been investigated. Variation of the metal centre allows tuning of the thermal expansion behaviour from colossal positive volumetric to extreme anomalous thermal expansion. Preparation of solid solutions increased the magnitude of the anomalous thermal expansion further, producing two species displaying supercolossal anisotropic thermal expansion (ZnCoCPHTαY2 = −712 MK−1, αY3 = 1632 MK−1 and ZnCdCPHTαY2 = −711 MK−1, αY3 = 1216 MK−1).