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. H-1 NMR diffusometry allowed to distinguish between the two isotropic phases in terms of diffusion characterized by different Arrhenius activation energy, while C-13 NMR static measurements and H-2 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.
NMR investigation of a thermotropic liquid crystal showing isotropic-isotropic'-(columnar)-cubic phase transitions
Mario CifelliMembro del Collaboration Group
;Valentina DomeniciMembro del Collaboration Group
;
2017-01-01
Abstract
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. H-1 NMR diffusometry allowed to distinguish between the two isotropic phases in terms of diffusion characterized by different Arrhenius activation energy, while C-13 NMR static measurements and H-2 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.File in questo prodotto:
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