Spectroscopic and Quantum-Chemical Study of Structure of Liquid Crystalline Cyanobiphenyls and Arylcyanopyridines

Abstract

Under study were the UV and PMR spectra as well as the electron structure of 4-alky1, 4-alkoxy-4-cyanobiphenyls, 6-p-alkylphenyl-, 6-p-alkoxyphenyl-3-cyanopyridines and 5-alkyl-2-p-cyanophenylpyridines in the ground and first excited states. To study these compounds a quantitative method is offered for determination the rotation angle between the planes of bicyclic molecular fragments based on the excitation theory within the frames of the Hiickel technique and on the UV spectroscopy data.

Mesogen Molecules Orientation on Crystal Surfaces

“…The rotation angle between both phenyl rings has been taken initially as zero. Then a more realistic value equal to 30 has been taken which was confirmed by quantum chemistry calculation [17][18].…”

From the discovery of the partially bilayer smectic A phase to blue phases in polar liquid crystals

“…These discoveries not only enabled the formulation of multicomponent nematic mixtures for use in displays operating over very long lifetimes and over large temperature ranges but also inspired the syntheses of analogous compounds with more polar pyrimidine 9, pyridine 10 or dioxane 7 rings. [4][5][6] Moreover, these inspired new research directions involving the properties of soft matter such as LCs.…”