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Orientational ordering studies of fluorinated thermotropic liquid crystals by NMR spectroscopy (Articolo in rivista)

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Orientational ordering studies of fluorinated thermotropic liquid crystals by NMR spectroscopy (Articolo in rivista) (literal)

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Alternative label

Calucci, Lucia; Geppi, Marco; Urban, Stanislaw (2014)
Orientational ordering studies of fluorinated thermotropic liquid crystals by NMR spectroscopy
in Magnetic resonance in chemistry (Print); John Wiley & Sons Ltd., Chichester (Regno Unito)
(literal)

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Consiglio Nazionale delle Ricerche; Universita di Pisa; Uniwersytet Jagiellonski w Krakowie (literal)

Titolo

Orientational ordering studies of fluorinated thermotropic liquid crystals by NMR spectroscopy (literal)

Abstract

Fluorinated calamitic thermotropic liquid crystals represent an important class of materials for high-tech applications, especially in the field of liquid crystal displays. The investigation of orientational ordering in these systems is fundamental owing to the dependence of their applications on the anisotropic nature of macroscopic optical, dielectric, and visco-elastic properties. NMR spectroscopy is the most powerful technique for studying orientational order in liquid crystalline systems at a molecular level thanks to the possibility of exploiting different anisotropic observables (chemical shift, dipolar couplings, and quadrupolar coupling) and nuclei (2H, 13C, and 19F). In this paper, the basic theory and NMR experiments useful for the investigation of orientational order on fluorinated calamitic liquid crystals are reported, and a review of the literature published on this subject is given. Finally, orientational order parameters determined by NMR data are discussed in comparison to those obtained by optical and dielectric anisotropy measurements. (literal)

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