Single-Benzene-Based Solvatochromic Chromophores: Color-Tunable and Bright Fluorescence in the Solid and Solution States
Single-Benzene-Based Solvatochromic Chromophores: Color-Tunable and Bright Fluorescence in the Solid and Solution States
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单苯溶剂致变色发色团：在固态和溶液状态下颜色可调且明亮的荧光
DOI：
10.1002/chem.201904478
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发表时间：
2019-12-06
影响因子：
4.3
通讯作者：
Fang, Yu
中科院分区：
文献类型：
--
作者：
Liu, Huijing;Yan, Sisi;Fang, Yu
寻找结构简单、荧光亮度高、溶剂相容性广的发色团是非常需要的。本文报道了一种新的单苯基溶剂致变色发色团，其具有对称的双功能结构，其中氮啶基和乙氧羰基分别作为给电子基团和吸电子基团。该发色团具有非常广泛的溶剂相容性，从非极性正己烷到极性甲醇，甚至在水中都能保持优异的荧光量子产率。不同寻常的是，随着溶剂极性的增加，发色团的对称结构显示出明显的颜色变化，从亮绿色到红色，并且在测试溶剂中具有较大的Stokes位移（λ =132-207 nm）。此外，该单苯基发色团在溶液和固体状态下都表现出良好的光化学稳定性，甚至表现出可逆的机械致色发光。
The search for structurally simple chromophores with superior fluorescence brightness and a wide range of solvent compatibility is highly desirable. Herein, a new type of single-benzene-based solvatochromic chromophore with a symmetric bifunctional structure, in which azetidine and ethoxycarbonyl moieties serve as the electron-donating and -withdrawing groups, respectively, is reported. This chromophore exhibits an extraordinary wide range of solvent compatibility and preserves excellent fluorescence quantum yields from nonpolar n-hexane to polar methanol and even in water. Unusually, the symmetric structure of the chromophore shows a distinct color change from bright green to red with increasing solvent polarity and possesses large Stokes shifts (lambda=132-207 nm) in the tested solvents. Moreover, this single-benzene-based chromophore displays good photochemical stability in both solution and solid states, and even exhibits reversible mechanochromic luminescence.