Nanofibers doped with a novel red-emitting Europium complex: Synthesis, characterization, photophysical property and sensing activity toward molecular oxygen

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• 作者：SUN Jianliang^a ; HU Ge^b ; ^{cquhuge1@163.com} ; SHE Qing^b ; ZUO Zhaohong^b ; GUO Lei^b
• 关键词：Eu(III) complex ; Photoluminescence ; Phosphorescence ; Oxygen sensing
• 刊名：Spectrochimica Acta Part A ; Molecular and Biomolecular Spectroscopy
• 出版年：2012
• 期刊代码：99_13861425
• 类别：ch
• 出版时间：June, 2012
• 卷：91
• 期：Complete
• 页码：192-197
• 文件大小：777 K

摘要

In this paper, we synthesize a novel diamine ligand of DIQ-Et and its corresponding Eu(III) complex of Eu(TTA)₃DIQ-Et, where DIQ-Et = N-ethyl-10H-dipyrido-[f,h]-indolo-[3,2-b]-quinoxaline, and TTA = 2-thenoyltrifluoroacetonate. The UV-vis absorption, photoluminescence, low temperature phosphorescence, energy transfer mechanism, and excited state lifetime of Eu(TTA)₃DIQ-Et are investigated in detail. Data suggest that the emission of Eu(TTA)₃DIQ-Et is quenchable by molecular oxygen due to the back-energy transfer process. By doping Eu(TTA)₃DIQ-Et into a polymer matrix of poly(vinylpyrrolidone) (PVP), oxygen sensing performance of the resulted nanofibers is investigated. Finally, the 0.7 wt%doped sample exhibits a linear response toward molecular oxygen, with a sensitivity of 2.4 and response/recovery time of 12 s/16 s.