Highly fluorescent new Schiff base chemosensors for the selective detection of Cu(II) and their application in bioimaging technique.

A new symmetrical and a new unsymmetrical Schiff bases are synthesized by condensing 1-(2,4-dihydroxyphenyl)ethanone with, Naphthalen-1-amine and Naphthalen-1,8-diamine under solvent free condition and characterized by IR, UV-visible, H NMR, C NMR and mass spectral studies. Cation recognizing potentiality of both the Schiff bases is explored-of the Schiff base 4-(1-(naphthalen-1-ylimino)ethyl)benzene-1,3-diol (NEBD) in aqueous methanolic medium and of Schiff base 4,4'-((naphthalene-1,8-diylbis(azanylylidene))bis(ethan-1-yl-1-ylidene))bis(benzene-1,3-diol) (NDBD) is scrutinized in aqueous ACN medium through dual modes namely absorption and emission methods. Both the Schiff base sensors are found to detect Cu(II) ion selectively.

5-Chlorosalicylaldehyde Based New Chromo-Fluorogenic Schiff base Probes for Cu(II), Mn(II), CN, S and CO ions - Appositeness in Bioimaging and Molecular Logic Gate.

Two new multifunctional fluorescent Schiff base chemosensors 2,2'-(4-chlorophenyl)methylene)bis(azanylylidene))bis(methanylylidene))bis(4-chlorophenol) (CSCB) and 2,2'-(4-methoxyphenyl)methylene)bis(azanylylidene))bis(methanylylidene))bis(4-chlorophenol) (CSMB) were synthesized by following solvent free one pot synthesis approach for the colorimetric detection of Cu(II), Mn(II), CO, S and CN ions. The Schiff base chemosensors showed a colorimetric response towards the ions, where there was appearance of yellow color over colorless Schiff base solution. The detection process was accomplished by absorption and emission methods in aqueous methanol medium.

Heterocyclic fluorescent Schiff base chemosensors for the detection of Fe(III) and Cu(II) ions.

Two new Schiff bases were synthesized from 1-(2,4-dihydroxyphenyl)ethanone and pyridine derivatives. Both compounds were characterized using infrared, UV-Vis., H NMR, C NMR and mass spectral studies.