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NMR investigation of a thermotropic liquid crystal showing isotropic-isotropic'-(columnar)-cubic phase transitions
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2017 (English)In: Molecular Crystals and Liquid Crystals, ISSN 1542-1406, E-ISSN 1563-5287, Vol. 649, no 1, p. 20-30Article in journal (Refereed) Published
Abstract [en]

In this work, we report a first detailed study of the mesophasic behaviour of the calamitic liquid crystal, a (4,4′-bis(4″-carboxybelzyloxy)biphenyl derivate, labelled 9/2 RS/RS, showing an isotropic-isotropic-(columnar)-cubic phase behaviour on cooling. 1H NMR diffusometry allowed to distinguish between the two isotropic phases in terms of diffusion characterized by different Arrhenius activation energy, while 13C NMR static measurements and 2H NMR investigations were of help in understanding the orientational ordering properties of the metastable columnar phase and confirmed the isotropic state of the sample in the cubic phase.

Place, publisher, year, edition, pages
Taylor and Francis Inc. , 2017. Vol. 649, no 1, p. 20-30
Keywords [en]
Liquid crystals, Metastable phases, Thermotropic liquid crystals, Arrhenius activation energy, Calamitic liquid crystal, Columnar phase, Isotropic phasis, Isotropic state, NMR diffusometry, Orientational orderings, Static measurements, Activation energy
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Chemical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-216495DOI: 10.1080/15421406.2017.1303595ISI: 000409263800004Scopus ID: 2-s2.0-85028753264OAI: oai:DiVA.org:kth-216495DiVA, id: diva2:1162006
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QC 20171201

Available from: 2017-12-01 Created: 2017-12-01 Last updated: 2017-12-01Bibliographically approved

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Dvinskikh, Sergey

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