Novel BODIPYs undergoing excited state intramolecular proton transfer are reported. The molecules afford NIR emission with a large Stokes shift and possess a free hydroxyl unit that is easy to functionalize, allowing the dyes to be exploited as a valuable scaffold in probe design.
A convenient strategy that does not need the tedious modification of the π-conjugation moiety to constructnearinfrared (NIR) sensors is in high demand. In this study, we present the design and synthesis of a NIR Hg(II) turn-on fluorescent sensor BODIPY-SAN, which shows several advantages including (1) simple to be synthesized by only a predictable modification of the core structure of 6-hydroxyindole-based
Based on 6-hydroxyindole BODIPY with a Schiff-base structure, NIR fluorescence with impressively high selectivity is triggered by deprotonation of the phenol group upon binding with Zn2+ due to the chelation-enhanced fluorescence effect, thus realizing a promising application in bioimaging of Zn2+.