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Synthesis, photophysical and oxygen-sensing properties of a novel Eu complex incorporated in mesoporous MCM-41 |
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| Authors: | Qinghui Zuo Bin Li Liming Zhang Yinghui Wang Yanhong Liu Jun Zhang Lifan Guo |
| Affiliation: | a Key Laboratory of Excited State Processes, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033, PR China b Graduate School of the Chinese Academy of Sciences, Chinese Academy of Sciences, Beijing 100039, PR China c Polyoxometalate Science Key Laboratory of Ministry of Education, Department of Chemistry, Northeast Normal University, Changchun 130024, PR China |
| Abstract: | A novel Eu3+ complex of Eu(DPIQ)(TTA)3 (DPIQ=10H-dipyrido [f,h] indolo [3,2-b] quinoxaline, TTA=2-thenoyltrifluoroacetonate) was synthesized and encapsulated in the mesoporous MCM-41, hoping to explore an oxygen-sensing system based on the long-lived Eu3+ emitter. The Eu(DPIQ)(TTA)3/MCM-41 composites were characterized by infrared spectra (IR), ultraviolet-visible (UV-vis) absorption spectra, small-angle X-ray diffraction (SAXRD), luminescence intensity quenching upon various oxygen concentrations, and fluorescence decay analysis. The results indicated that the composites exhibited the characteristic emission of the Eu3+ ion and the fluorescence intensity of 5D0-7F2 obviously decreased with increasing oxygen concentrations. The oxygen sensing properties of the composites with different loading levels of Eu(DPIQ)(TTA)3 complex were investigated. A sensitivity of 3.04, a short response time of 7 s, and good linearity were obtained for the composites with a loading level of 20 mg/g. These results are the best reported values for optical oxygen-sensing materials based on Eu3+ complexes so far. |
| Keywords: | Mesoporous composites Eu3+ complex Oxygen-sensing properties |
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