Thiol–ene click chemistry can be used as a facile cure-on-demand synthetic route to access robust host materials for solid-state upconversion.

The inner filter effect and multivariate array sensing using conjugated polymers are combined for the detection and challenging discrimination of closely related polycyclic aromatic hydrocarbons.

The evolution of conjugated polyelectrolytes (CPEs) that transduce analyte−receptor interactions into detectable fluorescent responses in complex aqueous environments is predicated on advancements in molecular design and improved synthetic accessibility. Here, we demonstrate a simple postpolymerization modification protocol, based on thiol−ene click chemistry, that results in the rapid installation of sodium sulfate terminated side-chains to a poly(fluorene-co-ethynyl) scaffold. The fluorescence of the resulting water-soluble CPE is quenched by Fe 3+ , dequenched selectively by pyrophosphate (PPi), and accurately quantifies PPi within ±6 nM in artificial seawater. The broad utility of thiol−ene click chemistry should offer the straightforward integration of diverse sensing elements.