The synthesis and characterization of novel coumarin dyes derived from 1,4-diethyl-1,2,3,4-tetrahydro-7-hydroxyquinoxalin-6-carboxaldehyde

Aqueous Red‐Emissive Probe for the Selective Fluorescent Detection of Cysteine by Deprotection/Cyclization Cascade Resulting in Large Stokes’ Shift

“…[9] Specifically acryloyl chloride and triethylamine were used to treat compound 1 in dichloromethane to give compound 2.F inally,t he treatment of compound 2 with malononitrile and piperidinium acetate in ethanol solventa t08Ca fforded Reals-C. Compound 1 was synthesized via ak nown literature procedure.…”

Synthesis, characterization, spectroscopic and electrochemical properties of phthalocyanines substituted with four 3-ferrocenyl-7-oxycoumarin moieties

“…The fluorescence property of coumarin chromophore system is significantly altered by appropriate substituents at the 3-and the 7-position. Electron donors such as amino, hydroxyl and methoxy groups at the 7-position and electron acceptor heterocyclic rings such as benzthiazole, benzoxazole and benzimidazole at the 3-position impart pronounced bathochromicity and strong fluorescence [39]. Fluorescence property of the 7-oxy-4-methylcoumarin substituted Pc (5) is strongly affected by the presence of ferrocenyl substituents.…”

A novel coumarin-based water-soluble fluorescent probe for endogenously generated SO2 in living cells

“…The differences in structure between the two probes were the substituents on the 7-position of coumarin, one being the cyclohexane diamine moiety, the other being the diethylin moiety. It was speculated that the coumarin-pyridinium conjugation with the cyclohexane diamine moiety would emit at a longer wavelength relative to that of the diethylin moiety, given that the introduction of a strong electron acceptor into the chromophore may lead to emission at a longer wavelength [36][37][38]. As is well known, the probe which emits at a longer wavelength is desirable on account of several factors, that is, minimal photo damage to the test sample, deep tissue penetration, and negligible interference from the background auto-fluorescence of biomolecules in the organism [39][40][41].…”