Exploring aggregation‐induced emission through tuning of ligand structure for picomolar detection of pyrene

Abstract

Tuning of ligand structures through controlled variation of ring number in fused‐ring aromatic moiety appended to antipyrine allows detection of 7.8 × 10−12 M pyrene via aggregation‐induced emission (AIE) associated with 101‐fold fluorescence enhancement. In one case, antipyrine unit is replaced by pyridine to derive bis‐methylanthracenyl picolyl amine. The structures of four molecules have been confirmed by single crystal X‐ray diffraction analysis. Among them, pyrene‐antipyrine conjugate (L) undergoes pyrene triggered inhibition of photo‐induced electron transfer (PET) leading to water‐assisted AIE.

Computer vision vs. spectrofluorometer-assisted detection of common nitro-explosive components with bola-type PAH-based chemosensors

“…PAHs are common components for NIR dyes, 30 OLEDs, 31 LC displays, 32 and batteries, 33 as well as photoresponsive materials 34 and photovoltaic devices. 30 Excimer emission of PAH-based uorophores is a convenient tool for the analysis of water or food samples, 35 for DNA studies, 36 as well as for the "turn-off' detection of various analytes/pollutants, 37 including (nitro)explosives. 38,39 In the last case the uorescence quenching of PAH uorophores via either charge or energy transfer is easily registered by a uorimeter.…”