Soma Mukherjee

A Reversible Pyrene-based Turn-on Luminescent Chemosensor for Selective Detection of Fe(3+) in Aqueous Environment with Logic Gate Application.

A new Schiff-base, HL luminescent chemosensor of 1-amino pyrene and 8-hydroxy quinoline-2-carboxaldehyde was synthesized which demonstrates selective fluorimetric detection of Fe3+ in aqueous medium with detection limit of 2.52 × 10−8 M. The receptor shows selective ‘turn-on’ response towards Fe3+ over other metal ions. This gradual ‘turn-on’ fluorescence response for Fe3+ may be induced via CHEF (chelation-enhanced fluorescence) through close proximity of pyrene rings. The stoichiometry and binding property of HL with Fe3+ was examined by emission studies. In presence of Fe3+, HL also exhibits reversible change in emission pattern with EDTA and thus offers an interesting property of molecular ‘INHIBIT’ logic gate with Fe3+ and EDTA as chemical inputs.

Pyrene Based Chemosensor for Selective Sensing of Fluoride in Aprotic and Protic Environment.

A new aromatic hydrazone based on pyrene-1-aldehyde was synthesized and characterized by 1H NMR and mass spectrometric analyses. The sensing properties of the hydrazone were studied by absorption and fluorescence studies in the aprotic solvent DMSO. It was capable of visual and fluorescent detection of fluoride over competitive ions (Cl−, Br−, H2PO4−, AcO−). Moreover, the in-situ prepared iron(III) complex of the hydrazone was investigated as a turn off fluorescent fluoride sensor in aqueous medium by displacement mechanism.

A quinoline based pH sensitive ratiometric fluorescent sensor: Structure and spectroscopy

AbstractA new quinoline based hydrazone was synthesized via a condensation reaction and characterized by NMR, mass and single crystal X-ray diffraction studies. It was investigated for suitability as a reversible ratiometric fluorescent pH sensor in acidic pH region. The sensor exhibits intramolecular charge transfer (ICT) type photophysical changes upon protonation of the quinoline ring. No significant interference on emission behavior was observed in the presence of various metal ions. Graphical AbstractA new quinoline based hydrazone was established as a reversible ratiometric fluorescent pH sensor in the acidic pH region and structurally characterized by single crystal X-ray diffraction studies. It exhibits intramolecular charge transfer (ICT) type photophysical changes upon protonation of quinoline ring.

Crystal structure of 2,2-di-phenyl-hydrazinium chloride.

In the title molecule, the phenyl rings are inclined to one another by 78.63 (17)°. In the crystal, molecules are linked via N—H⋯Cl hydrogen bonds, forming chains along [10-1], which enclose two adjacent (6) ring motifs.