Detection of Moisture by Fluorescent OFF-ON Sensor in Organic Solvents and Raw Food Products

Abstract

Copper complex based on a new class of fluorescence OFF-ON sensor 1.Cu has been reported for the detection of trace amounts of water in various organic solvents such as CHOH, THF, CHCN, and acetone by means of fluorescence emission intensity. The probe is highly responsive to water in THF (DL = 0.003 wt %). The dissociation of copper from probe 1.Cu in the presence of water is responsible for the fluorescence change and it was confirmed by electrospray ionization-mass spectrometry (ESI-MS), proton nuclear magnetic resonance (H-NMR), and fluorescence lifetime studies. Real application of the probe was successfully applied for the detection of moisture content in commercial products such as salt, sugar, wheat, and washing powder.

Smart lanthanide antennas for sensing water

“…The limit of detection values [defined as LOD = (3.3 Â SD)/K SV , 27 where K SV is the Stern-Volmer constant] were 0.025% for the Eu 3+ complex of 1 and 0.019% for the Tb 3+ complex of 3. These values are comparable to those of the most sensitive water sensors described up to date (in the range of 0.002-0.2% for CH 3 CN), 2,28 including some lanthanide complexes and metal-organic frameworks (MOFs, in the range of 0.003-0.05%). 12,29,30 In conclusion, we have presented herein two new families of lanthanide antennas that, interestingly, are among the smallest lanthanide antennas able to coordinate these cations, sensitizing their luminescence.…”

Development of an intramolecular charge transfer-type colorimetric and fluorescence sensor for water by fusion with a juloidine structure and complexation with boron trifluoride

“…Therefore, the optical properties should be sensitive to water molecules and variable depending on the water content. Several strategies have been demonstrated to meet the requirement, such as intramolecular charge transfer (ICT), [5][6][7][8][9] excited state intramolecular proton transfer (ESIPT), [9][10][11] photo-induced electron transfer (PET), [12][13][14][15][16][17][18] aggregation-induced emission (AIE), 7,29,30 decoloration of hydrogen-bonding photochromic dyes, 31 and other water-triggered mechanisms. [19][20][21][22][23][24][25][26][27][28] Generally, in each system, there is a specic range of water concentration available for detection; AIE is observed in high water concentrations, 7,29,30 whereas other systems exhibit optical changes in a relatively low concentration range.…”

A fluorescent Cu(ii) complex as a dual functional sensor for selective and sensitive detection of acetone and Cd(ii) pollutants

“…42 For example, Amilan Jose et al reported the detection of water in various organic solvents, such as methanol, tetrahydrofuran (THF), acetonitrile, and acetone, using uorescence emission intensity in the presence of a Cu complex probe. 43 The luminescence properties of complex 1 dissolved in acetonitrile were studied at room temperature. It was found that 1 exhibited an intense emission band at l em ¼ 650 nm (l ex ¼ 267 nm).…”