Issue 34, 2018

AIE-active bis-cyanostilbene-based organogels for quantitative fluorescence sensing of CO2 based on molecular recognition principles

Abstract

Carbon dioxide is a major greenhouse gas, probably responsible for climate change, and a safety concern for workers under specific conditions. Simple and effective means for its detection are thus highly desirable. Herein, the aggregation-induced emissive bis-cyanostilbene derivative 1 was used to develop two sensor systems based on (i) dispersed gel aggregates and (ii) solid supported xerogels for the optical detection of CO2 gas. In the presence of diethylamine, CO2 is transformed into a carbamate ionic liquid (CIL), which binds to 1 acting as an anion receptor. The formation of such a host–guest adduct alters the aggregation state of the system and consequently its fluorescence, which thus responds to CO2 concentration. While the gel aggregate sensing system responds to CO2via fluorescence quenching, the xerogel sensor system works in a dual mode, i.e., by both fluorescence quenching and modulation, reaching very high sensitivity and a low detection limit (4.5 ppm). The sensing behavior of 1 (gel aggregate and xerogel systems) towards CO2 gas was studied in detail by solid state fluorescence and solution 1H-NMR spectroscopies.

Graphical abstract: AIE-active bis-cyanostilbene-based organogels for quantitative fluorescence sensing of CO2 based on molecular recognition principles

Supplementary files

Article information

Article type
Paper
Submitted
11 Mar 2018
Accepted
30 Jul 2018
First published
17 Aug 2018

J. Mater. Chem. C, 2018,6, 9232-9237

AIE-active bis-cyanostilbene-based organogels for quantitative fluorescence sensing of CO2 based on molecular recognition principles

Y. Ma, M. Cametti, Z. Džolić and S. Jiang, J. Mater. Chem. C, 2018, 6, 9232 DOI: 10.1039/C8TC01190G

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