Barrio, Jorge R.; Sattsangi, Prem D.; Gruber, Bruce A.; Dammann, Laurence G.; Leonard, Nelson J. published an article in 1976, the title of the article was Species responsible for the fluorescence of 3,N4-ethenocytidine.Recommanded Product: 55662-66-3 And the article contains the following content:
The fluorescence properties of 3,N4-ethenocytidine (ε-cytidine) (I), substituted derivatives, and closely related 2-ring heterocycles were examined The chloroacetaldehyde-modified cytidine is fluorescent only in its protonated form. The fluorescence emission maximum is 340 nm and the pKa* is 4.0, very close to the value for the ground state. N-1-alkylation of I at the same position as protonation makes reversion to the nonfluorescent type of structure impossible, on changing the pH, and accordingly the fluorescence emission characteristics are preserved over a wide range of pH. The presence of the n→π* transition of the carbonyl group in I is responsible for the lack of fluorescence in neutral solution Even I.HCl has a low fluorescence quantum yield (Φ < 0.01) and a short fluorescence lifetime (τ = 30 psec). Ring substitution produces a red shift of the π → π* transition, due to inductive or mesomeric effects and a clear improvement in the fluorescence emission characteristics; e.g., 2-acetylamino-5,6-dihydro-5-oxo-6-β-D-ribofuranosylimidazo[1,2-c]pyrimidine, in its protonated form, shows Φ = 0.85 and τ = 4 ns. Imidazo[1,2-a]pyridine, a close model for I lacking the carbonyl group and accordingly the n → π* transition, has a high fluorescence quantum yield and long lifetime in either neutral solution or organic solvents. Both N-1-protonated and -alkylated imidazo[1,2-a]pyridines have emission maxima similar to those observed for I.HCl but higher quantum yields. The experimental process involved the reaction of Imidazo[1,2-c]pyrimidin-5(6H)-one(cas: 55662-66-3).Recommanded Product: 55662-66-3
The Article related to fluorescence etherocytidine, cytidine etheno fluorescence, Carbohydrates: Nucleosides, Nucleotides and other aspects.Recommanded Product: 55662-66-3
Referemce:
Imidazole – Wikipedia,
Imidazole | C3H4N2 – PubChem