Abstract
The viscosity-sensitive range of arguably the most popular fluorescent viscosity sensor (“molecular rotor”), which is based on a BODIPY moiety, has been dramatically enhanced by introducing a heavy electron-withdrawing −NO2 group. This makes the molecule useful for viscosity-sensing in highly viscous samples. Furthermore, the reason behind this improvement, as well as the photophysical action mechanism of BODIPY molecular rotors, was explained by theoretical calculations. More information can be found in the Full Paper by A. Vyšniauskas et al. on page 10342.
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