UltrapHSensitive Small Molecule Probe Showing a Ratiometric Fluorescence Color Change
- UltrapHSensitive Small Molecule Probe Showing a Ratiometric Fluorescence Color Change
- 김세훈; Junjie Cui; 김가영; 권지언; 박수영
- Issue Date
- VOL 4, NO 6-397
- We synthesized an amphiphilic small molecule 1 by attaching oligo(ethylene glycol) (OEG) and N,Ndiethylamine (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 selfassembles 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 42fold within a very narrow pH？range of 4.3？4.6.
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