Universal quenching of common fluorescent probes by water and alcohols

Jimmy Maillard, Kathrin Klehs, Christopher Rumble, Eric Vauthey, Mike Heilemann, Alexandre Fürstenberg

Research output: Contribution to journalArticlepeer-review

6 Scopus citations

Abstract

Although biological imaging is mostly performed in aqueous media, it is hardly ever considered that water acts as a classic fluorescence quencher for organic fluorophores. By investigating the fluorescence properties of 42 common organic fluorophores recommended for biological labelling, we demonstrate that H2O reduces their fluorescence quantum yield and lifetime by up to threefold and uncover the underlying fluorescence quenching mechanism. We show that the quenching efficiency is significantly larger for red-emitting probes and follows an energy gap law. The fluorescence quenching finds its origin in high-energy vibrations of the solvent (OH groups), as methanol and other linear alcohols are also found to quench the emission, whereas it is restored in deuterated solvents. Our observations are consistent with a mechanism by which the electronic excitation of the fluorophore is resonantly transferred to overtones and combination transitions of high-frequency vibrational stretching modes of the solvent through space and not through hydrogen bonds. Insight into this solvent-assisted quenching mechanism opens the door to the rational design of brighter fluorescent probes by offering a justification for protecting organic fluorophores from the solventviaencapsulation.

Original languageEnglish (US)
Pages (from-to)1352-1362
Number of pages11
JournalChemical Science
Volume12
Issue number4
DOIs
StatePublished - Jan 28 2021

All Science Journal Classification (ASJC) codes

  • Chemistry(all)

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