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| Open AccessA general design of caging-group-free photoactivatable fluorophores for live-cell nanoscopy
The design of photoactivatable fluorophores—which are required for some super-resolution fluorescence microscopy methods—usually relies on light-sensitive protecting groups imparting lipophilicity and generating reactive by-products. Now, it has been shown that by exploiting a unique intramolecular photocyclization, bright and highly photostable fluorophores can be rapidly generated in situ from appropriately substituted 1-alkenyl-3,6-diaminoxanthone precursors.
- Richard Lincoln
- , Mariano L. Bossi
- & Stefan W. Hell
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News & Views |
Staining a porous catalyst
The structural features and catalytic performances of catalyst particles have now been correlated using a fluorescence microscopy approach, by tracking nanoprobes as well as fluorescent reaction products. Such mapping enables exploration of structure–function relationships, which is essential for the design of better catalysts.
- Wei Wang
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Visualizing pore architecture and molecular transport boundaries in catalyst bodies with fluorescent nanoprobes
The accessibility of materials’ porous domains is typically explored through bulk, and often non-visual, measurements. Now, an integrated fluorescence microscopy approach has established a direct visual relationship between pore architecture (which depends on pore sizes and interconnectivity), molecular transport, and in turn catalytic performance in industrial-grade catalyst particles.
- Gareth T. Whiting
- , Nikolaos Nikolopoulos
- & Bert M. Weckhuysen
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Theory-driven design of high-valence metal sites for water oxidation confirmed using in situ soft X-ray absorption
Water oxidation is key to the production of chemical fuels from electricity. Now, guided by theory, NiCoFeP oxyhydroxide catalysts have been developed that require an overpotential lower than that required by IrO2. In situ soft X-ray absorption studies of neutral-pH NiCoFeP catalysts indicate formation of Ni4+, which is favourable for water oxidation.
- Xueli Zheng
- , Bo Zhang
- & Edward H. Sargent
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Suppression of Kasha's rule as a mechanism for fluorescent molecular rotors and aggregation-induced emission
A family of fluorescent molecular rotors has been developed and their mechanism for emission understood. It has been observed that, although most fluorescent molecules emit from their lowest energy excited state, S1 (in accordance with Kasha's rule), BODIHY dyes do not. Furthermore, their fluorescence is enhanced through restricted rotor rotation, which suppresses internal conversion to the dark S1 state.
- Hai Qian
- , Morgan E. Cousins
- & Ivan Aprahamian
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News & Views |
Excitations get random
The fate of newly created excited states in conjugated materials is not fully understood, with unanswered questions regarding where exactly excitons form and their subsequent behaviour. Now, single-molecule spectroscopy studies of large conjugated molecular wheels reveal that excitons localize at random positions around the wheel rims.
- Ivan G. Scheblykin
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Fluctuating exciton localization in giant π-conjugated spoked-wheel macrocycles
A deficiency in our molecular-level understanding of the electronic structure of conjugated polymers hinders their potential use in electronic applications. Shape-persistent highly ordered ring structures have been used to mimic conjugated polymers and have now been studied using single-molecule spectroscopy. The fundamentally non-deterministic nature of excitation energy localisation in π-conjugated macromolecules has been demonstrated.
- A. Vikas Aggarwal
- , Alexander Thiessen
- & John M. Lupton