Coumarin-3-Aldehyde as a Scaffold for the Design of Tunable PET-Modulated Fluorescent Sensors for Neurotransmitters

NeuroSensor 521 (NS521) is a fluorescent sensor for primary‐amine neurotransmitters based on a platform that consists of an aryl moiety appended to position C4 of the coumarin‐3‐aldehyde scaffold. We demonstrate that sensors based on this platform behave as a directly linked donor–acceptor system th...

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