Journal
CHEMISTRY-A EUROPEAN JOURNAL
Volume 28, Issue 48, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.202201130
Keywords
boranes; DNA; RNA sensors; fluorescent probes; singlet oxygen; theranostics
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Funding
- Croatian Science Foundation [IP-2018-01-5475]
- DAAD
- Deutsche Forschungsgemeinschaft [DFG - MA4471/10-1]
- Julius-Maximilians-Universitat Wurzburg
- Projekt DEAL
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This study synthesized three novel tetracationic bis-triarylboranes with 3,4-ethylenedioxythiophene (EDOT) linkers, resulting in red-shifted absorption and emission. One of the EDOT derivatives emitted in the near-infrared (NIR) region. Comparative analysis showed that only the EDOT-linked trixylylborane tetracation was stable in aqueous solution, suggesting the insufficient hydrolytic stability of directly attaching thiophene or 3-methylthiophene to the boron atom. Furthermore, the EDOT-linked trixylylborane tetracation and its bis-thiophene analogue exhibited efficient photo-induced singlet oxygen production with significant biological implications.
Three novel tetracationic bis-triarylboranes with 3,4-ethylenedioxythiophene (EDOT) linkers, and their neutral precursors, showed significant red-shifted absorption and emission compared to their thiophene-containing analogues, with one of the EDOT-derivatives emitting in the NIR region. Only the EDOT-linked trixylylborane tetracation was stable in aqueous solution, indicating that direct attachment of a thiophene or even 3-methylthiophene to the boron atom is insufficient to provide hydrolytic stability in aqueous solution. Further comparative analysis of the EDOT-linked trixylylborane tetracation and its bis-thiophene analogue revealed efficient photo-induced singlet oxygen production, with the consequent biological implications. Thus, both analogues bind strongly to ds-DNA and BSA, very efficiently enter living human cells, accumulate in several different cytoplasmic organelles with no toxic effect but, under intense visible light irradiation, they exhibit almost instantaneous and very strong cytotoxic effects, presumably attributed to singlet oxygen production. Thus, both compounds are intriguing theranostic agents, whose intracellular and probably intra-tissue location can be monitored by strong fluorescence, allowing switching on of the strong bioactivity by well-focused visible light.
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