A new “off-on-off” sensor for sequential detection of Al3+ and Cu2+ with excellent sensitivity and selectivity based on different sensing mechanisms

A new sensor based on thieno[2,3‐b]quinoline for the detection of In3+, Fe3+ and F− by different fluorescence behaviour

“…Fluorescent probes have been widely studied due to the advantages of simple synthesis, small sample requirement, short response time, good selectivity, and high sensitivity. [ 26–28 ] In recent years, large numbers of Fe 3+ fluorescent probes have been reported, [ 29–32 ] but In 3+ fluorescent probes have been rarely reported. For F − , some sensors have been reported.…”

1,8‐Naphthalimide‐Based Chemosensors: A Promising Strategy for Detection of Metal Ions in Environmental and Biological Systems

“…[138][139][140][141][142][143][144][145] Studies have found that the excess presence of Al 3 + leads to various neurological disorders like dementia, Alzheimer's disease, and Parkinson's disease. [146][147][148][149][150] Whereas, its high concentration in soil has a detrimental effect on plant growth and affects its productivity. As per WHO directions, the permissible intake for the human body is 3-10 mg/day and its concentration in drinking water is found to be 7.41 μM.…”

A salicylaldehyde benzoyl hydrazone based near-infrared probe for copper(ii) and its bioimaging applications

“…In addition, these compounds display keto-enol tautomerism, and both the nitrogen atom and oxygen atom in the Schiff bases can act as ligand donors for Cu 2+ and consequently produce stable coordination complexes via coordination effects. 40,41 The phenol group in phenol-based Schiff base units is deprotonated in the coordination process, which could diminish the electrondonating ability of the oxygen atom. [42][43][44][45][46] Moreover, it has been reported that the uorescence signal of hemicyanine-based NIR uorophores could be turned in a controllable manner by diminishing the electron-donating ability of the oxygen atom in its phenol group.…”