国产三级在线,99免费精品视频,日韩精品人妻中文字幕有码无码,午夜福利视频无码一区二区三区

測量應用案例-20210501

文獻名： A H2O-induced fluorescence turn-on diarylethene derivative and its fluorescent sensing Al3+

作者：Wenhao Pan^a; Chunhong Zheng^a; Guanming Liao^a; Gang Liu^a; Shouzhi Pu^ab

^a  Jiangxi Key Laboratory of Organic Chemistry, Jiangxi Science and Technology Normal University, Nanchang 330013, PR China

^b  Department of Ecology and Environment, Yuzhang Normal University, Nanchang 330103, PR China

摘要：A diarylethene derivative has been synthesized by attaching a photochromic core to a pyrazine moiety through an aroylhydrazone linker. The compound showed weak excited state intramolecular proton transfer (ESIPT) based fluorescence in a series of polar solvents such as CH₃CN, THF, DMSO, CH₃CH₂OH, CH₃OH and their binary mixtures with water. However, when the water fraction in solutions was above 70%, a strong orange ESIPT emission at ~ 580 nm was found, which originated molecules aggregate and ESIPT. The active ESIPT process remains in the solid state, which exhibited orange fluorescence under 365 nm light illumination. The diarylethene derivative has been found to show fluorescence ‘‘turn-on’’ sensing Al³⁺ in CH₃CN with the detection limit of 16.6 nM. Al³⁺ enhanced the fluorescence with 30 nm blue shifts and the fluorescence can be ON and OFF through interaction with Al³⁺ and EDTA. Moreover, the Al³⁺ in several water samples was detected using the sensor with high accuracy.

關(guān)鍵詞：Aggregated-induced emission (AIE); Photochromism; Excited-state intramolecular proton transfer (ESIPT); Fluorescence sensing; Al³⁺ ion