Modulating the Self-Assembly of Calix[4]azacrowns to Design Materials with Improved Emission and Stimuli-Responsive Behavior
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- 作者：Issam Oueslati ; Jos茅 A. Paix茫o ; Vitor H. Rodrigues ; Aleksander Shkurenko ; Barbara Le艣niewska ; Kinga Suwinska ; M. Ermelinda S. Eus茅bio ; Teresa M. R. Maria ; J. S茅rgio Seixas de Melo
- 刊名：Journal of Physical Chemistry C
- 出版年：2014
- 出版时间：June 19, 2014
- 年：2014
- 卷：118
- 期：24
- 页码：13118-13125
- 全文大小：520K
- 年卷期：v.118,no.24(June 19, 2014)
- ISSN：1932-7455
文摘
1,3-[Ethylene-bis(aminocarbonylmethyl)]-p-tert-butylcalix[4]arene is analyzed and its optical properties are investigated, showing luminescence upon aggregation at low temperature or in the solid state described as aggregation-induced blue emission. The shift of the self-assembly from nanoporous to helical framework in the crystal is associated with a remarkable blue-shift and 33-fold increase in the fluorescence intensity. The purple-blue light emission is highly efficient (桅F 60%) and is switched to thermally activated yellow emission as a stimuli-responsive behavior of the helical assembly. The emitting material has been characterized by single crystal and powder X-ray diffraction, ATR-FTIR spectroscopy, and DSC and PLTM analysis, and its optical properties are investigated.