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Dielectric Properties of Liquid Crystalline Isothiocyanato-tolane Derivatives with Fluorine Atom at Various Lateral Positions

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Czub J., Urban S., Dąbrowski R., Gestblom B.

Acta Physica Polonica A

2005

vol. 107

issue 6

947-958

Dielectric studies were performed for several isothiocyanato-tolane compounds having the F atom attached to the benzene rings at different lateral positions and the alkoxy or alkyl chain at the p-position. They form the nematic phase in broad temperature intervals. The static as well as dynamic properties of the compounds in the nematic and isotropic phases were studied. Tensor permittivity components: ε_ǁ, ε_⊥, Δε, as functions of temperature were measured. The complex dielectric permittivity, ε^*(f)=ε'(f)-iε''(f), was measured in the frequency range of 1 kHz - 3 GHz from which the relaxation times τ_ǁ and τ_⊥ were calculated. The order parameter S(T) was determined from the dielectric data. It was found that the close vicinity of the F atom and the alkoxy group results in blocking of the internal rotation of the wing around the O-phenyl bond.

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1 Acta Physica Polonica A

1 2005

1 Czub J.

1 Dąbrowski R.

1 Gestblom B.

1 Urban S.

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Dielectric Properties of Liquid Crystalline Isothiocyanato-tolane Derivatives with Fluorine Atom at Various Lateral Positions