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We describe the photoinduced intrachain crosslinking of coumarin-containing copolymers in various organic solvents. Analysis of copolymer solvation and comparison to a molecular coumarin derivative revealed solvophobicity-driven crosslinking kinetics and chain compaction that facilitated the synthesis of single-chain nanoparticles.more » « less
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Polymerization-induced self-assembly (PISA) is a facile method to obtain block copolymer aggregates with defined morphologies. However, the transitions between these morphologies have been difficult to monitor directly in real-time during the polymerization. Herein, we describe a straightforward and readily accessible in situ method to monitor the evolution of nanostructure via changes in internal hydrophobicity during the PISA process using a polymer-tethered pyrene fluorescent probe. We were able to correlate morphological transitions with changes of the pyrene emission and gain unprecedented insight into the evolution of core hydrophobicity during PISA.more » « less
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null (Ed.)We describe a self-catalyzing photoredox polymerization system for the modular generation of macromolecular photocatalysts. Specifically, we designed a photoactive eosin Y-derived monomer that can induce photoelectron/energy transfer, while simultaneously partaking in reversible addition–fragmentation chain transfer polymerization as a monomer, affording polymer catalysts with tunable eosin Y incorporations.more » « less
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null (Ed.)We report the one-step synthesis of diversely substituted functional 1,2-dithiolanes by reacting readily accessible 1,3-bis- tert -butyl thioethers with bromine. The reaction proceeds to completion within minutes under mild conditions, presumably via a sulfonium-mediated ring closure. Using X-ray crystallography and UV-vis spectroscopy, we demonstrate how substituent size and ring substitution pattern can affect the geometry and photophysical properties of 1,2-dithiolanes.more » « less
