A Rhodamine‐based Fluorescent Chemodosimeter for Au3+ in Aqueous Solution and Living Cells

Structure–metal ion selectivity of rhodamine-based chemosensors

“…Pitsanuwong and co-workers reported rhodamine N-hydroxysemicarbazide ( 101 ) as a chemodosimeter for Au 3+ in H 2 O/EtOH (1 : 1, v/v, phosphate buffer, pH 7.4). 115 Its LOD was reported to be 5.0 × 10 −7 M. Here the metal ion catalyzed the conversion of 101 (Scheme 18) to its cyclic form, 1,3,4-oxadiazole-2-one rhodamine derivative. A recent report by Huang et al shows the Hg 2+ -promoted formation of a 1,3,4-oxadiazole derivative from a quinoline-rhodamine derivative ( 102 ) (Scheme 18) in water (pH 7.0).…”

A reaction-based scenario for fluorescence probing of Au(iii) ions in human cells and plants

“…8,9 Recent progress in sensing gold ions has enriched the current understanding of how fluorescent probes should be designed for gold ions. [10][11][12][13][14][15][16][17][18][19][20][21][22][23][24] To date, most published strategies for gold ion sensing rely on specific chemical reactions that exploit the alkynophilic [25][26][27][28][29][30][31][32] and/or Lewis acidic behavior 33 of gold ions. Gold is most often detected with reference to a structural modification of the probe's skeleton, which generates one of two optical signals: a change in color or fluorescence emission.…”

Tannic acid as a chemosensor for colorimetric detection of Fe(II) and Au(III) ions in environmental water samples

“…[ 5–7 ] The key for the effective colorimetric depends on the emerging highly selective and sensitive chromogenic chemosensors developed in this study and other studies for the determination of heavy metal ions. [ 8–15 ]…”

“…[5][6][7] The key for the effective colorimetric depends on the emerging highly selective and sensitive chromogenic chemosensors developed in this study and other studies for the determination of heavy metal ions. [8][9][10][11][12][13][14][15] The common oxidation states of iron are divalent and trivalent. According to the WHO standards, the concentration of Fe(II) cations in drinking water shall not exceed 5.35 μM, while water, which will be used for agricultural irrigation, shall not exceed 89.5 μM iron cations.…”