Phosphorescence properties of hydroxy-substituted flavones

Georgievskii, V. P.; Rybachenko, A. I.

doi:10.1007/bf00614722

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Cited by 5 publications

(8 citation statements)

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“…Two fluorescence bands are observed, having ffuorescent in neutral aqueous solution a t room temperature, as it is in tetrachloromethane 20 or ethanol. 21 We noticed, however, the development of a fluorescence band a t 400-420 nm in aqueous, alcoholic acetonitrile or dioxan solution within a few minutes. The new band is found in addition to a strong Raman scatter peak a t ca.…”

Section: Resultsmentioning

confidence: 79%

pH-Dependent fluorescence spectroscopy. Part 12. Flavone, 7-hydroxyflavone, and 7-methoxyflavone

Schipfer¹,

Wolfbeis²,

Knierzinger³

1981

J. Chem. Soc., Perkin Trans. 2

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Section: Resultsmentioning

confidence: 79%

pH-Dependent fluorescence spectroscopy. Part 12. Flavone, 7-hydroxyflavone, and 7-methoxyflavone

Schipfer¹,

Wolfbeis²,

Knierzinger³

1981

J. Chem. Soc., Perkin Trans. 2

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“…An example of molecules of this type is the flavonols. 3-Hydroxyflavone (3-HF) − and, to a lesser extent, 5-hydroxyflavone (5-HF) − were extensively studied. Both steady-state fluorescence and time-resolved techniques were employed to study the ESIHT process of these two molecules.…”

Section: Introductionmentioning

confidence: 99%

Excited-State Intramolecular Proton Transfer of the Natural Product Quercetin

Simkovitch

Huppert

2015

J. Phys. Chem. B

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Intramolecular proton-transfer dynamics in the lowest excited state (ESIHT) were studied in the natural product quercetin. We found that in all seven solvents used in this study, the ESIHT rate is ultrafast. We estimate that the ESIHT rate is about 70 fs or less. We found that in deuterated protic solvents, such as methanol-d or ethanol-d, the ESIHT rate is slower and the proton-transfer time constant is about 110 fs. The tautomeric form fluorescence quantum yield of quercetin is very low, of the order of the normal form.

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“…Phosphorescence has been reported for various hydroxy-substituted flavones [40]. Phosphorescence is reported to arise from a 3(n,n*) state of these nonfluorescent molecules.…”

Section: Miscellaneousmentioning

confidence: 98%