Effect of Fluoroalkyl-Substituent in Bistolane-Based Photoluminescent Liquid Crystals on Their Physical Behavior
| Autor: | Yizhou Wang, Tomohiro Agou, Qingzhi Zhang, Masato Morita, Mitsuo Hara, Hiroki Fukumoto, David O'Hagan, Masakazu Nagata, Tsutomu Konno, Toshio Kubota, Shigeyuki Yamada |
|---|---|
| Přispěvatelé: | University of St Andrews. School of Chemistry, University of St Andrews. EaSTCHEM, University of St Andrews. Biomedical Sciences Research Complex |
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Phase transition
Materials science Photoluminescence General Chemical Engineering Substituent Bistolane 010402 general chemistry 01 natural sciences Inorganic Chemistry chemistry.chemical_compound flexible chain Liquid crystal Phase (matter) Moiety QD General Materials Science liquid crystal Alkyl chemistry.chemical_classification Crystallography 010405 organic chemistry bistolane π-conjugate Intermolecular force DAS QD Chemistry Condensed Matter Physics T Technology 0104 chemical sciences Fluoroalkyl chemistry QD901-999 Flexible chain fluoroalkyl photoluminescence π-Conjugate alkyl |
| Zdroj: | Crystals Volume 11 Issue 4 Crystals, Vol 11, Iss 450, p 450 (2021) |
| ISSN: | 2073-4352 |
| DOI: | 10.3390/cryst11040450 |
| Popis: | Funding: This research was funded by JSPS KAKENHI through a Grant-in-Aid for Scientific Research (C), grant number JP18K05262. Photoluminescentliquid crystals (PLLCs) have attracted significant attention owing to their broad applicabilityin thermosensing and PL switching. Extensive efforts have been madeto develop bistolane-based PLLCs containing flexible units at both molecular terminals, and it has been revealed that their PL behavior can switch with the phase transition between the crystallineand LC phases. Although slight modulation of the flexible unit structure dramatically alters the LC and PL behaviors, few studies into modification of the flexible units have been conducted. With the aim of achieving dynamic changes in their physical behaviors, we developed a family of bistolane derivatives containing a simple alkyl or a fluoroalkyl flexible chain, and carried out a detailed systematic evaluationof their physical behaviors. Bistolanes containing a simple alkyl chain showed a nematic LC phase, whereas switching the flexible chain in the bistolane to a fluoroalkyl moiety significantly altered the phase to generate a smectic phase. The fluoroalkyl-containing bistolanes displayed a stronger deep blue PL than their corresponding non-fluorinated counterparts, even in the crystalline phase, which was attributed to the construction of rigid molecular aggregates through intermolecular F···H and F···F interactions to suppress non-radiative deactivation. Publisher PDF |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|