A novel chromogenic and fluorogenic chemosensor for detection of trace water in methanol

Solvatochromic Surface-Passivated Carbon Dots for Fluorometric Moisture Sensing in Organic Solvents

“…Karl-Fischer titration has been widely used to detect water in organic solvents. While this analytical method is precise and well accepted, it has many disadvantages including lengthy and costly procedures, the requirement of highly trained staff and specialized equipment, low sensitivity, and the use of solvents in high volume together with the release of hazardous chemical waste, which might have an environmental and health impact. , Thus, greener and safer alternatives that offer reliable and cost-effective moisture sensing are of great interest. Fluorescence-based sensing has attracted considerable attention as it provides straightforward and rapid analysis of many different analytes with high sensitivity and selectivity. , Some optical materials and dyes show solvent polarity-dependent switchability by displaying a change in their absorption and emission spectra as they have different charge transfer energy levels in excited states depending on the solvent polarity. , Interest in the solvatochromic materials as probes for optical moisture detection in organic solvents increases with an increased amount of literature showing their potential in the development of humidity sensors with a tunable emission spectrum, high sensitivity, and lower detection limits, which could be helpful to overcome the aforementioned limitations of traditional moisture detection methods. , …”

“…While this analytical method is precise and well accepted, it has many disadvantages including lengthy and costly procedures, the requirement of highly trained staff and specialized equipment, low sensitivity, and the use of solvents in high volume together with the release of hazardous chemical waste, which might have an environmental and health impact. 1,2 Thus, greener and safer alternatives that offer reliable and cost-effective moisture sensing are of great interest. Fluorescence-based sensing has attracted considerable attention as it provides straightforward and rapid analysis of many different analytes with high sensitivity and selectivity.…”

A sensitive fluorescent sensor for the detection of trace water in organic solvents based on carbon quantum dots with yellow fluorescence

“…Therefore, the determination of the water content in the organic solvent is one of the most important and most commonly encountered analytical problems. 2,3,5,7,13 In order to explore the possibility for application of the asprepared CQDs in the detection of water content in organic solvents, the uorescence emission spectra excited by the light of 440 nm of CQDs dispersed in ethanol were further examined. As shown in Fig.…”

“…The detection of trace water in organic solvents is an important analytical tool in several elds of industry and chemistry. [1][2][3][4][5][6][7] The existence of water may cause hydrolysis of organic solvents and increase the formation of oxidation products during storage of organic solvents. [8][9][10][11][12][13][14] At present, water content is usually measured by a classic Karl-Fisher titration.…”

“…1,4,8,11,14,18À21 Most of the uorescent sensors currently developed for the detection of water in organic solvents are based on organic uorescent dyes and uorescent conjugated polymers. 3,8,11,13,15 Yang et al reported several uorescence water probes based on merocyanine dyes, uorescein derivative, 8-hydroxyquinoline derivative, merocyanine dyes and a phenol-indole dye. 17 However, organic uorescent dyes also have disadvantages such as difficulty in synthesis, long preparation period, certain toxicity of the dye itself, and environmental pollution.…”