Coumarin Based Highly Selective “off-on-off” Type Novel Fluorescent Sensor for Cu2+ and S2- in Aqueous Solution was written by Karuk Elmas, Sukriye Nihan;Ozen, Furkan;Koran, Kenan;Yilmaz, Ibrahim;Gorgulu, Ahmet Orhan;Erdemir, Serkan. And the article was included in Journal of Fluorescence in 2017.Electric Literature of C5H6ClN This article mentions the following:
Solvent-free synthesis of 6,7-dihydroxy-3-(3-chlorophenyl) coumarin (CFHC) was designed and obtained by the interaction of 2-(2,4,5-trimethoxyphenyl)-1-(3-chlorophenyl)acrylonitrile with pyridinium hydrochloride in the presence of silica gel by using microwave irradiation The characterization of CFHC was confirmed by FT-IR, 1H, 13C, 13C-APT and 2D HETCOR spectroscopy methods. The optical behavior of CFHC towards metal ions was investigated by UV-visible and fluorescence spectroscopy. CFHC showed “on-off” type fluorescence response towards Cu2+ with high selectivity in aqueous solution (CH3CN/H2O, 9/1, volume/volume). Once binding with Cu2+, CFHC-Cu2+ complex also displayed high selectivity for sulfide, resulting in “off-on” type sensing of sulfide anion. In the experiment, the researchers used many compounds, for example, Pyridinehydrochloride (cas: 628-13-7Electric Literature of C5H6ClN).
Pyridinehydrochloride (cas: 628-13-7) belongs to pyridine derivatives. Pyridines are an important class of heterocycles and occur in polysubstituted forms in many naturally occurring biologically active compounds, drug molecules and chiral ligands. Reduced pyridines, namely tetrahydropyridines, dihydropyridines and piperidines, are found in numerous natural and synthetic compounds. The synthesis and reactivity of these compounds have often been driven by the fact many of these compounds have interesting and unique pharmacological properties. Electric Literature of C5H6ClN