Influence of Thiophenes on Molecular Order, Mesophase, and Optical Properties of π-Conjugated Mesogens
| Autor: | Nitin P. Lobo, E. Varathan, Tanneru Narasimhaswamy, K. Rajasekhar Reddy, Shanmugam Easwaramoorthi |
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| Rok vydání: | 2016 |
| Předmět: |
Materials science
Mesophase 02 engineering and technology Conjugated system 010402 general chemistry 021001 nanoscience & nanotechnology Ring (chemistry) 01 natural sciences Coupling reaction 0104 chemical sciences Surfaces Coatings and Films Electronic Optical and Magnetic Materials chemistry.chemical_compound Crystallography General Energy Terthiophene chemistry Liquid crystal Phase (matter) Polymer chemistry Thiophene Physical and Theoretical Chemistry 0210 nano-technology |
| Zdroj: | The Journal of Physical Chemistry C. 120:22257-22269 |
| ISSN: | 1932-7455 1932-7447 |
| Popis: | Increasing interest in π-conjugated aromatic cores built essentially with thiophene rings is recognized owing to their applications in optoelectronics. In this investigation, an attempt is made to understand the influence of terminal thiophene rings on the molecular order, mesophase, and optical properties of mesogens in which phenyl benzoate is part of the core. Accordingly, mono-, di-, and terthiophene units are linked to two phenyl ring core by Suzuki cross coupling reaction. The synthesized thiophene-based π-conjugated mesogens exhibit enantiotropic nematic and smectic phases with excellent mesophase range. The tendency for smectic phases and the mesophase range enhanced with increased thiophene rings. The layer ordering in smectic A and smectic C phase is established by powder X-ray diffraction, while the orientational order of all the rings of core unit is accomplished by 13C NMR spectroscopy. Thus the 13C–1H dipolar couplings determined from 2D separated local field NMR experiments show a very high... |
| Databáze: | OpenAIRE |
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