Abstract
The authors took an independent and closer look at the family of red-emitting rhodamine dyes known for a decade due to their excellent performance in STED microscopy. After the family was further extended, the true grounds of this performance became clear. Small-molecule protective agents and/or auxiliary groups were attached at two different sites of the dye’s scaffold. Thus, a rhodamine core, which is already quite photostable as it is, and an intramolecular stabilizer–a 4-nitrobenzyl or a 4-nitrobenzylthio group were combined to give potentially “everlasting dyes”. The fluorescence quantum yields (Φf) and the fluorescence lifetimes (τ) of the modified dyes were thoroughly measured with comparison to those of the parent dyes. The correlation of their STED performance with photostability and fluorescence color stability under illumination in water were explored. Unexpectedly, the anaerobic GSDIM (GOC) buffer proved unhelpful with respect to STED performance. It was demonstrated that, even dyes with a Φf of only 14–17% allow STED imaging with a sufficient photon budget and good signal-to-noise ratio. For the dyes with photostabilizing groups (PSG) the Φf values are 4–5 times lower than in the reference dyes, and lifetimes τ are also strongly reduced. Noteworthy are very high fluorescence color stability and constant or even increasing fluorescence signal under photobleaching in bulk aqueous solutions, which suggests a sacrificing role of the 4-nitrobenzyl-containing moieties. Straightforward and improved recipes for “last-minute” modifications and preparations of “self-healing” red-emitting fluorescent tags are described.
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Kolmakov, K., Winter, F.R., Sednev, M.V. et al. Everlasting rhodamine dyes and true deciding factors in their STED microscopy performance. Photochem Photobiol Sci 19, 1677–1689 (2020). https://doi.org/10.1039/d0pp00304b
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DOI: https://doi.org/10.1039/d0pp00304b