Fluorescence Quenching of Poly[2-methoxy-5-（2′-ethylhexoxy）-p-phenylene vinylene] （MEH-PPV） in Solutions

Fluorescence quenching processes of poly[2-methoxy-5-(2‘ethyl-hexoxy)-p-phenylene vinylene] (MEH-PPV) in solution by electron acceptors, O2 and acid, have been studied. Static quenching of the fluorescence from MEH-PPV by an electron acceptor (DDQ or TCNE) occurs due to electron transfer from MEH-PPV to the electron acceptor and this electron transfer quenching can be promoted by chloroform. Photooxidation takes place in the MEH-PPV solution and singlet oxygen is an intermediate in the photooxidation, according to the results of ESR spectroscopy. Acid also plays an important role in the fluorescence quenching process of MEH-PPV, by the protonation of the alkoxy groups in the molecular chain.     

Fluorescence Quenching of Poly[2-methoxy-5-(2''''-ethylhexoxy)-p-phenylene vinylene](MEH-PPV) in Solutions

Introduction Poly(1,4-phenylene vinylene) (PPV) has been the subject of explosive interest in these years. It has poten-tial applications in light-emitting diode, light emitting electrochemical cell and plastic laser.1-4 To improve its solubility and optical properties substituents are intro-duced to the PPV main chain. Poly[2-methoxy-5-(2'-ethylhexoxy)-p-phenylene vinylene] (MEH-PPV) is one of derivatives with alkoxy groups on phenyl rings. It exhibits superior solubility in organic sol…     

F~-发光探针的设计策略和应用研究

氟离子在人类的生产生活以及生态平衡等方面都起着非常重要的作用。生理上,人体中大部分的氟存在于牙齿和骨骼,氟化物与人体生命活动以及牙齿骨骼组织代谢密切相关,氟离子缺乏或摄入过量都会导致严重的健康问题。生态中,用含氟水灌溉,含氟尘埃沉降,以及土壤中的空气与受氟污染大气的交换,都会使土壤和地下水受到污染。因此,对生理以及自然环境中氟离子的定量检测和控制有重要意义。由于传统检测方法的局限性,具有选择性好、可视化检测以及原位无损等优点的发光检测技术成为物质检测与分析领域的热点,基于发光检测技术的氟离子发光探针的设计方法也引起了科研工作者极大的研究兴趣,并将其运用在生物检测或者实际的生活产品中。本综述总结了近五年来基于不同种类及检测机理设计的氟离子探针的研究进展,同时对探针的负载和应用方式进行了深入分析,最后对氟离子发光探针的发展方向进行了展望。