Fluorescent Chemosensor for Detection and Quantitation of Carbon Dioxide Gas

Abstract

CO(2) sensing is of great societal implications, as CO(2) is a component of gas mixtures from many natural and anthropogenic processes with huge impacts on globe climate and human well-being. Herein we report a CO(2) assay scheme over a wide concentration range, utilizing a fluorogen with an aggregation-induced emission feature and a liquid with tunable polarity and viscosity. The CO(2) sensing process is specific, quantitative, and interferent tolerant.

Applications of Ionic Liquids for the Development of Optical Chemical Sensors and Biosensors

“…Table S1 (Supporting Information) displays the developed optical sensors prepared using ILs and compares their analytical characteristics. [49][50][51] As shown in Table S1, the overwhelming majority of the developed optical sensors are either colorimetric, spectrophotometric or fluorescent. Such sensors involve a sensing platform in the form of one of the aforementioned materials that contain a chemically active sensing agent (a recognition element).…”

“…44,48,49 Being viscous, the resultant IL is a free flowing liquid. 48 Recently, some "task-specific" or "functionalized" ILs, for instance, carboxylated, 50 carbamate, 51,52 amidine, 53 and polydiacetylene-imidazolium 54 ILs are used for CO2 detection. As a rule, functionalized ILs bear functional groups in their cations [50][51][52][53][54] and more rarely in their anions (8-hydroxyperene-1,3,6-trisulfonate (pyranine), HPTS 3-in [P6, 6,6,14] [58][59][60][61] Polybenzimidazole-based PILs are obtained by anion exchange of Br -on Tf2N -, BF4 -, and Ac -of partly quaternized polybenzimidazole, PBI-BuI (Fig.…”

“…55 Liu et al 51 and Tian et al 53 developed specially designed CO2 chemosensors based on a novel photophysical effect aggregation-induced emission. Carbamate and amidine ILs that were the products of the reactions between CO2 and dipropylamine 51 or amidinebased compounds 53 increased viscosity and polarity of the reaction media. The change of the media properties resulted in the formation of the highly emissive aggregates of 1,1,2,3,4,5-hexaphenylsilole, HPS (Fig.…”

“…The change of the media properties resulted in the formation of the highly emissive aggregates of 1,1,2,3,4,5-hexaphenylsilole, HPS (Fig. 3.3) 51 and tetraphenylethylene 53 from their non-fluorescent molecules. The amidine-based fluorescent chemosensor had an extraordinarily high waterresistant property and was free of CO-interference problems.…”

“…The use of ILs provides both high and low CO2 concentration determination. 51,75,76,81,82,94 The colorimetric sensor with [BMIm]BF4 and pH-indicator BT in a silicone matrix allows the semi-quantitative determining of 2% CO2 and lower concentrations in the gas phase. 81 The sensor based on the same matrix, but with the fluorescent indicator HPTS dissolved in [BMIm]Tos allows detecting up to 20% gaseous CO2.…”