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Ultra‐pH‐Sensitive Small Molecule Probe Showing a Ratiometric Fluorescence Color Change
ChemPhotoChem ( IF 3.0 ) Pub Date : 2020-02-19 , DOI: 10.1002/cptc.202000023
Junjie Cui 1 , Gayoung Kim 2 , Sehoon Kim 2 , Ji Eon Kwon 1 , Soo Young Park 1
Affiliation  

We synthesized an amphiphilic small molecule 1 by attaching oligo(ethylene glycol) (OEG) and N,N‐diethylamine (DEA) units to a fluorescent dicyanodistyrylbenzene (DCS) core. The molecule is fully soluble in aqueous solution at low pH (pH<4.3) by protonation of the DEA groups; but, above pH 4.3, it self‐assembles to form nanoparticles due to increased hydrophobicity upon deprotonation, leading to a ratiometric fluorescence color change from green emission in the monomeric form (λem,max=538 nm) to red emission in the aggregated form (λem,max=646 nm). It should be noted that the ratio of emission intensities at 538 nm and 646 nm (R=I538/I646) changes drastically about 42‐fold within a very narrow pH range of 4.3–4.6.

中文翻译:

超pH敏感的小分子探针,显示比例荧光色变

我们通过将寡聚乙二醇(OEG)和NN-二乙胺(DEA)单元连接到荧光二氰基二苯乙烯基苯(DCS)核上,合成了两亲小分子1。通过DEA基团的质子化,该分子在低pH(pH <4.​​3)下完全溶于水溶液。但在pH值高于4.3时,由于去质子作用时疏水性增加,它会自组装形成纳米颗粒,从而导致荧光颜色从单体形式的绿色发射(λem,max = 538 nm)变为聚集形式的红色发射,呈比例荧光变化(λem,max= 646nm)。应该注意的是,在538 nm和646 nm处的发射强度之比(R = I 538 / I 646)在4.3-4.6的非常狭窄的pH范围内急剧变化约42倍。
更新日期:2020-02-19
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