Highly sensitive fluorescent polyamide for detection of Hg2+, Hg+, Fe3+, and Fe2+ions

Development of sulfur doped carbon quantum dots for highly selective and sensitive fluorescent detection of Fe2+ and Fe3+ ions in oral ferrous gluconate samples

Sulfur-doped carbon quantum dots (S-CQDs) with stable blue fluorescence were synthesized through a facile one-step hydrothermal method by using ascorbic acid and thioglycolic acid as carbon and sulfur sources. The prepared S-CQDs exhibited a sensitive and selective response to Fe³⁺ ions in comparison with Fe²⁺ and other metal ions, In the presence of adequate H₂O₂, Fe²⁺ was completely transformed to Fe³⁺ that is the determinable form of iron ions, and the difference in the change of the fluorescence intensity of S-CQDs before and after adding H₂O₂ was used for detection of Fe²⁺ and Fe³⁺ ions, respectively. Under the optimum experimental conditions, the fluorescence intensity of S-CQDs gradually decreased with increasing of Fe³⁺ concentration ranging from 0 to 200 μM. Good linearity was achieved over the range of 0-200 μM. The detection limit of the developed method was 0.050 μM for Fe³⁺. The recoveries of Fe²⁺ and Fe³⁺ spiked in real samples ranged from 98.2% to 112.4%. Finally, the proposed S-CQDs integrated with Fenton system was applied to the detection of Fe²⁺ and Fe³⁺ ions in oral ferrous gluconate samples, which presents potential applications in the speciation and determination of Fe²⁺ and Fe³⁺ ions in complex samples.

Rhodamine based turn-on chemosensor for Fe3+ in aqueous medium and interactions of its Fe3+ complex with DNA

A novel di-coordinating rhodamine-based chemosensor, HL with NO donor atoms, selectively and rapidly recognizes Fe³⁺ in the presence of all biologically relevant as well as toxic metal ions and numerous anions and also with other reactive oxygen and nitrogen species.

A turn-on fluorogenic chemosensor for Fe3+ and a Schottky barrier diode with frequency-switching device applications

A novel highly sensitive and selective fluorescent chemosensor L has been synthesized and characterized by various physicochemical techniques.

A rhodamine based turn-on chemosensor for Fe3+ in aqueous medium and interactions of its Fe3+ complex with HSA

A novel hexa-coordinating rhodamine-based chemosensor, HL6, selectively and rapidly recognizes Fe³⁺ in the presence of a number of metal cations, numerous anions and amino acids in purely aqueous medium with live cell imaging applications.