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Ground and excited state proton transfer of 4-methyl-2,6-diformylphenol in different solvent mixtures

✍ Scribed by Ranjan Das; Sivaprasad Mitra; Samaresh Mukherjee

Publisher: Elsevier Science
Year: 1994
Tongue: English
Weight: 439 KB
Volume: 221
Category: Article
ISSN: 0009-2614
DOI: 10.1016/0009-2614(94)00284-3

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✦ Synopsis

Proton transfer in the ground and excited states of 4-methyl-2,6-diformylphenol (MFOH) in ethanol/water, ethanol/metha-no1 and ethanol/dioxane solvent mixtures has been studied using steady state and nanosecond transient emission spectroscopy. The lifetime is not affected much in water/alcohol mixtures, although in ethanol/dioxane mixture the lifetime varies considerably with solvent composition. The emission intensity and fluorescence quantum yield varies with the mixed solvent composition. It is proposed that both dissociation and recombination reactions contribute to the decay rates in ethanol/water and ethanol/ methanol solvent mixtures. The presence of methanol or water in the mixture quenches the fluorescence in ethanol. To study the photochemical quenching intensity the data are analyzed by the Stern-Volmer equation.

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