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摘要
Manipulation of a multi‐physical quantity to steer a molecular photophysical property is of great significance in improving sensing performance. Here, an investigation on how a physical quantity rooted in the molecular structure induces an optical behavior change to facilitate ultrasensitive detection of ethylenediamine (EDA) is performed by varying a set of thiols. The model molecule consisting of a thiol with dual‐carboxyl exhibits the strongest fluorescence, which is ascribed to the electron‐donating ability and prompted larger orbital overlap and oscillator strength. The elevated fluorescence positively corelated to the increased EDA, endowing an ultrasensitive response to the nanomolar‐liquid/ppm‐vapor. A gas detector with superior performance fulfills a contactless and real‐time management of EDA. We envisage this electron‐tuning strategy‐enabled fluorescence enhancement can offer in‐depth insight in advancing molecule‐customized design, further paving the way to widening applications.(#br)A positive correlation was built between the electron‐donating capability and fluorescence intensity based on a molecular mode of how physical quantities affect optical behavior. This model has a fluorescent‐colorimetric dual‐response with nanomolar‐liquid/ppb‐vapor ultra‐sensitivity to ethylenediamine (EDA), which was integrated into a gas detector, fulfilling real‐time management of EDA to address leakage risk and threat to public safety.
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