以苯并[b]噻吩为供体的D -π-A染料的溶剂致变色和pH开关性质

IF 2.4 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY

Journal of Molecular and Engineering Materials Pub Date : 2021-11-09 DOI:10.1142/s2251237321500027

Li Feng, Pengyu Wang, Hansen Yang, Zhuo Chen, S. Bo

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引用次数: 0

摘要

以N，N-二己基苯并[b]噻吩-6-胺为供体，2-（3-氰基-4，5，5-三甲基呋喃-2（5H）-亚乙基）丙二腈（TCF）为受体，通过钯催化的Hartwig–Buchwald偶联和Knoevenagel缩合反应合成了具有D–[式：见正文]–A结构的电荷转移染料。通过紫外-可见吸收光谱和荧光发射光谱研究了合成染料的溶剂化变色和pH切换特性。观察到染料在不同极性溶剂中的正溶剂化色度以及溶液的可见颜色变化。通过在染料的DMSO溶液中加入酸/碱，溶液的颜色以及吸收和发射光谱表现出突出的pH切换特性。

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Solvatochromic and pH Switch Properties of a D–π–A Dye with benzo[b]thiophene as Donor Moiety

A charge transfer dye with the D–[Formula: see text]–A structure was synthesized by Pd catalyzed Hartwig–Buchwald coupling and Knoevenagel condensation reaction, using N, N-dihexylbenzo[b]thiophen-6-amine as donor and 2-(3-cyano-4, 5, 5-trimethylfuran-2 (5H)-ylidene)malononitrile (TCF) as acceptor. The solvatochromic and pH switch properties of the as-synthesized dye were investigated through UV-vis absorption and fluorescence emission spectra. A positive solvatochromism of the dye in different polar solvents was observed along with a visible color change of the solution. By adding acid/base into the DMSO solution of the dye, the color as well as the absorption and emission spectra of the solution exhibited outstanding characteristics of pH switch.

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Journal of Molecular and Engineering Materials MATERIALS SCIENCE, MULTIDISCIPLINARY-

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