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
| Autor: | M. Kuvvet, M. Akbaş, M. Yazıcı, B. Acemioğlu |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
Materials science
02 engineering and technology General Chemistry 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Molecular physics Fluorescence 0104 chemical sciences chemistry.chemical_compound Dipole Nuclear magnetic resonance chemistry Liquid crystal Excited state General Materials Science Carboxylate Absorption (chemistry) 0210 nano-technology Refractive index Octane |
| Zdroj: | Liquid Crystals. 43:671-679 |
| ISSN: | 1366-5855 0267-8292 |
| DOI: | 10.1080/02678292.2016.1139197 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|