Twisting (conformational changes)-based selective 2D chalcogeno podand fluorescent probes for Cr(iii) and Fe(ii)

Abstract

The fluorenoazomethine containing chalcogeno podand fluorescent probes having N, O/S/Se coordinating donor unit show donor specific 'turn-on' recognition property towards metals (Cr(III), Fe(II) and Cu(II)), where the fluorescence signals are controlled by the conformational change of the ligand framework on binding with the metal ion.

Reduced fluorenoazomethine based photoluminescence turn-on sensors for transition metal ions

“…It is tempting at this stage to compare the photophysical properties of the reduced azomethines (3,4) with their Schiff base counterparts (1, 2). 9 The absorption spectra of 1 and 2 show similar but red-shied ($20 nm) features, which is consistent with the fact that reduction of azomethine bond results in a loss of extended p-conjugation in 3 and 4. Loss of conjugation and a corresponding blue-shi is also evident in the PL spectra of 3 and 4, vis-à-vis 1 and 2 (Fig.…”

Synthesis, characterization and coordination properties of bis(alkyl)selenosalen ligands

“…The unsymmetrical 10 monoselenides 1-3 were obtained by the reaction of bis(o-formylphenyl)diselenide with NaBH 4 followed by the addition of methyl iodide, decyl bromide and dodecyl bromide, respectively. 11 The bis(o-formylphenyl)diselenide was prepared from o-chlorobenzaldehyde following the reported procedure. 12 The compounds 1-3 were obtained as viscous liquids at ambient temperature.…”

Highly selective visual detection of Fe3+ at ppm level

“…However, the reaction schemes for the synthesis of such reported sensors are very complex, require extreme reaction conditions and are also expensive. On the other hand phenol-based Schiff bases are known as good -conjugated ligands for metal ions [42][43][44][45][46][47][48]. This work is ongoing part of our research interest [49][50][51][52].…”