Quinoline-tagged fluorescent organic probes for sensing of nitro-phenolic compounds and Zn²⁺ions at the ppb level

Abstract

With a variation in the spacer from flexible tetra-methylene to semi-rigid xylylene, connecting quinoline chromophores and Lewis basic pyridyl groups on both ends, two new fluorescent sensors, N,N’-bis(pyridin-2-ylmethyl)-N,N’-bis(quinolin-2-ylmethyl)butane-1,4-diamine (bqbpbn, 1)...

Metal‐Free Visible‐Light Catalytic Deoxygenation of Azaaryl N‐Oxides: Harnessing Photons for Efficient Greener Synthesis

“…are very important class of compounds due to their ubiquitous presence in natural products , [3] various bioactive compounds and their industrial utility as ligands [4] and other value-added organic materials. [5] Functionalizing these electrondeficient azaheterocycles often necessitates the activation and directing capabilities of their respective N-oxides to selectively target suitable sites for modification. [6] These azaarene N-oxides play a crucial role in selectively introducing versatile functional groups onto specific positions of azaarene molecules, enabling a broad array of chemical reactions and expanding synthetic possibilities.…”

Idiosyncatic recognition of Zn2+ and CN− using pyrazolyl-hydroxy-coumarin scaffold and live cell imaging: depiction of luminescent Zn(ii)-metallocryptand

“…Polypodal Schiff bases may synthesize multinuclear metallo–macrocycle complexes, 1,2 which may act as potential magnetic materials, 3,4 homogeneous catalysts, 5 optical and electronic materials, 6,7 sensing devices, 8 etc . Schiff bases with fluorogenic components such as carbazole, 9,10 quinoline, 11,12 rhodamine, 13,14 naphthyl, 15,16 pyrenyl, 17,18 fluorenyl, 19,20 and diformyl 21,22 influence the emission energy, intensity, pattern, and the molecules might serve as sensitive detectors of ions/molecules. Fluorogenic units of Coumarin derivatives 23–25 are beneficial for their diverse pharmacological properties, low toxicity, and interesting photophysical responses to analytes.…”