Thermotropic Liquid-Crystalline and Light-Emitting Properties of Bis(4-aalkoxyphenyl) Viologen Bis(triflimide) Salts
| Autor: | Raymond G Cortez, Hari D. Mandal, Lewis Sharpnack, Si L. Chen, Satyendra Kumar, Dena Mae Agra-Kooijman, Haesook Han, Jongin Kim, Bryan Gutierrez, Andy Ho, Anthony Chang, Klarissa Mendez, Shane T. Killarney, Pradip K. Bhowmik, Michael Fisch, Muhammed Kareem M Al-Karawi, Ronald Carlo G. Principe, Erenz J. Dizon |
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| Rok vydání: | 2020 |
| Předmět: |
Thermogravimetric analysis
Magnetic Resonance Spectroscopy Materials science Light smectic phase A thermotropic Pharmaceutical Science chemistry.chemical_element Thermotropic crystal Article Viologens metathesis reaction Analytical Chemistry lcsh:QD241-441 Differential scanning calorimetry lcsh:Organic chemistry polarizing optical microscopy Drug Discovery Polymer chemistry medicine Salt metathesis reaction Physical and Theoretical Chemistry extended viologens thermogravimetric analysis Calorimetry Differential Scanning Cyclohexanones Organic Chemistry Viologen Zincke salt Liquid Crystals X-ray diffraction chemistry Chemistry (miscellaneous) X-ray crystallography Alkoxy group Molecular Medicine Salts Lithium ionic liquid crystals differential scanning calorimetry medicine.drug |
| Zdroj: | Molecules Volume 25 Issue 10 Molecules, Vol 25, Iss 2435, p 2435 (2020) |
| ISSN: | 1420-3049 |
| Popis: | A series of bis(4-alkoxyphenyl) viologen bis(triflimide) salts with alkoxy chains of different lengths were synthesized by the metathesis reaction of respective bis(4-alkoxyphenyl) viologen dichloride salts, which were in turn prepared from the reaction of Zincke salt with the corresponding 4-n-alkoxyanilines, with lithium triflimide in methanol. Their chemical structures were characterized by 1H and 13C nuclear magnetic resonance spectra and elemental analysis. Their thermotropic liquid-crystalline (LC) properties were examined by differential scanning calorimetry, polarizing optical microscopy, and variable temperature X-ray diffraction. Salts with short length alkoxy chains had crystal-to-liquid transitions. Salts of intermediate length alkoxy chains showed both crystal-to-smectic A (SmA) transitions, Tms, and SmA-to-isotropic transitions, Tis. Those with longer length of alkoxy chains had relatively low Tms at which they formed the SmA phases that persisted up to the decomposition at high temperatures. As expected, all of them had excellent thermal stabilities in the temperature range of 330&ndash 370 ° C. Their light-emitting properties in methanol were also included. |
| Databáze: | OpenAIRE |
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