Determination of the ground- and excited-state dipole moments of 4'-(hexyloxy)-4-biphenylcarbonitrile and 4-isothiocyanatophenyl 4-pentylbicyclo [2,2,2] octane-1-carboxylate nematic liquid crystals and their mixtures

The dipole moments of the ground and excited states of 4′-(hexyloxy)-4-biphenylcarbonitrile and 4-isothiocyanatophenyl 4-pentylbicyclo [2.2.2] octane-1-carboxylate nematic liquid crystals and their mixtures prepared in chloroform and dichloromethane were studied at room temperature. The dipole momen...

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Published in:Liquid crystals 2016-04, Vol.43 (5), p.671-679
Main Authors: Yazıcı, M., Acemioğlu, B., Akbaş, M., Kuvvet, M.
Format: Article
Language:English
Subjects:
absorbance
Crystals
Dipole moment
Excitation
fluorescence
Ground state
Grounds
Liquid crystals
Mathematical analysis
Nematic crystals
Nematic liquid crystal
Physical properties
Spectra
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description The dipole moments of the ground and excited states of 4′-(hexyloxy)-4-biphenylcarbonitrile and 4-isothiocyanatophenyl 4-pentylbicyclo [2.2.2] octane-1-carboxylate nematic liquid crystals and their mixtures prepared in chloroform and dichloromethane were studied at room temperature. The dipole moments of the ground states of the all samples were calculated according to the Guggenheim-Smith method. The dipole moments of their excited states were determined with the help of the Lippert equation by measuring the absorption and fluorescence spectra, solvent polarity and refractive index values. It was determined that dipole moments of the excited states were higher than those of the ground states. Moreover, the dipole moments of the ground and excited states of two nematic liquid crystals were also estimated by using molecular mechanic method (Gaussian09 program (DFT/B3LYP 6-31G(dp)). The results obtained are interpreted in detail.
doi_str_mv 10.1080/02678292.2016.1139197
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The dipole moments of the ground states of the all samples were calculated according to the Guggenheim-Smith method. The dipole moments of their excited states were determined with the help of the Lippert equation by measuring the absorption and fluorescence spectra, solvent polarity and refractive index values. It was determined that dipole moments of the excited states were higher than those of the ground states. Moreover, the dipole moments of the ground and excited states of two nematic liquid crystals were also estimated by using molecular mechanic method (Gaussian09 program (DFT/B3LYP 6-31G(dp)). 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subjects absorbance
Crystals
Dipole moment
Excitation
fluorescence
Ground state
Grounds
Liquid crystals
Mathematical analysis
Nematic crystals
Nematic liquid crystal
Physical properties
Spectra
title Determination of the ground- and excited-state dipole moments of 4'-(hexyloxy)-4-biphenylcarbonitrile and 4-isothiocyanatophenyl 4-pentylbicyclo [2,2,2] octane-1-carboxylate nematic liquid crystals and their mixtures
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