competing metal ions (Ag+, Cu+, Hg2+, Mg2+, Ca2+, Co2+, Zn2+, Mn2+, Ni2+, Fe2+ and Fe3+). Based on the experimental results, the sensing mechanism was proposed for the Cu2+ triggered hydrolysis of 1 to BF2–curcumin which has unique chromogenic and fluorogenic properties. Compared with other chemosensors with a similar mechanism, chemosensor 1 had a comparatively large Stokes shift and the emission
Consistent with their quadrupolar nature, these molecules show varying degrees of solvatochromic behavior in both their absorption and emission spectra, which has been analyzed by Lippert–Mataga and Kamlet–Taft analysis. Photophysical and photoacoustic (PA) properties of these molecules have been investigated by the optical photoacoustic z‐scan (OPAZ) method. Selected curcuminoid molecules display nonlinear
本文介绍了一系列包含 π 扩展芳基和供电子氨基末端功能化的供体-π-受体-π-供体 (D-A-D) 类姜黄素分子的合成和表征。计算评估表明,这些分子具有四极特性,能量跃迁最低,显示出高摩尔消光系数,通过操纵末端供体基团具有广泛的可调性。与其四极性质一致,这些分子在其吸收和发射光谱中显示出不同程度的溶剂化变色行为,这已通过 Lippert-Mataga 和 Kamlet-Taft 分析进行了分析。已经通过光学光声z研究了这些分子的光物理和光声 (PA) 特性-扫描(OPAZ)方法。选定的类姜黄素分子通过激发态吸收在高激光能量密度下表现出非线性行为,这转化为增强的光声发射的产生。“摩尔 PA 发射”的相对比较也与结晶紫线性光吸收/线性 PA 发射系统一起被用作 OPAZ 实验的标准参考材料。此外,还介绍了 PA 层析成像实验,以说明通过激发态吸收可获得的增强 PA 对比度。
A low background D–A–D type fluorescent probe for imaging of biothiols in living cells
Two probes, structurally symmetric CBFB and asymmetric CBFM, constructed by a D–A–D (donor–acceptor–donor) type curcuminoid as the fluorophore and the DNBS (2,4-dinitrobenzenesulfonyl) group as the biothiol recognition site were designed and synthesized here. The DNBS group can quench the emission of the fluorophore by the PET (photoinduced electron transfer) process, and in the presence of biothiols
simultaneous detection of Aβ fibrils and inhibition of their neurotoxicity is highly desirable for study of Alzheimer's disease. Although various fluorophores have been developed for imaging of Aβ fibrils or plaques, they suffer from serious self-quenching at high concentration and a lack of neuroprotective functions. To tackle these challenges, we herein develop a multi-functional probe of Cur-N-BF2
Highly sensitive and selective recognition behaviour for fluoride based on a homoditopic curcumin-difluoroboron receptor
作者:Yuyu Fang、Miao Wang、Yurong Shen、Mei Zhang、Zhixing Cao、Yun Deng
DOI:10.1016/j.ica.2020.119413
日期:2020.4
fluorescent changes were observed in the presence of fluoride, which could be easily distinguished by the naked eye. Test strips experiment further demonstrated its potentially practical feasibility to recognize fluoride. Importantly, our work shown here not only represents the first chemodosimeter for selective fluorescent and colorimetric recognition towards anion in the field of curcumin chemistry, but also