An Efficient Fluorescence "Turn-On" Chemosensor Comprising of Coumarin and Rhodamine Moieties for Al and Hg.

A potent fluorescence 'turn-on' receptor (HL) based on rhodamine and coumarin moieties for the detection of Hg and Al is synthesized by condensation of rhodamine 6G hydrazide and 4-hydroxy-3-acetylcoumarin. In presence of Al and/or Hg the receptor (HL) exhibits deep pink colouration and a sharp band at 528 nm is appeared in UV-vis titration. Upon gradual addition of Al and/or Hg to the solution of HL significant enhancement of fluorescence intensity is observed at 564 nm in MeCN:HO (1:5, v/v) medium.

A Phenanthraquinone Based Fluorescent Probe for Sequential Detection of Cu and SO.

Herein we report the selective detection of Cu and SO by phenanthraquinone thiosemicarbazone (PQTSC) chemosensor. The chemosensor is efficient in detecting Cu over other metal ions, while the PQTSC-Cu complex selectively sense SO over other anions. On addition of Cu to the receptor solution, quenching of emission intensity is observed by 16 folds and upon gradual addition of SO to this solution, the emission intensity increases and the maxima is regained.

Novel pyridyl based azo-derivative for the selective and colorimetric detection of nickel(II).

A highly sensitive and selective pyridyl based colorimetric chemosensor (H2L) for the efficient detection of Ni(2+) has been reported. The synthesized chemosensor H2L is highly efficient in detecting Ni(2+) even in the presence of other metal ions that commonly co-exist with Ni(2+). H2L also shows distinct color change from green to deep red visible under naked eye due to specific binding with Ni(2+).