Spectroscopic evidence of .ALPHA.,.ALPHA.-dihydroxy ketone in biacetyl aqueous solutions.
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概要
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From the analysis of emission, excitation, absorption, and <SUP>1</SUP>H NMR spectra of 2,3-butanedione (i.e., biacetyl), it has been established that about two thirds of the molecule in aqueous solutions exists as 3,3-dihydroxy-2-butanone (i.e., a hydrated form of biacetyl). For the first time, two different types of emission are discriminated: Emission is mostly due to the fluorescence spectrum of the monoketone upon irradiation of light with a shorter wavelength than 320 nm while it is due to the strong phosphorescence spectrum of biacetyl itself upon irradiation of light with a longer wavelength than 350 nm. The almost stoichiometric molecular rearrangement from the hydrated (monoketone) form in a water phase to the ordinary (diketone) form in a hydrocarbon phase has been found to take place.
- 公益社団法人 日本化学会の論文
著者
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Nakashima Kenichi
Department Of Chemistry Faculty Of Science And Engineering Saga University
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Koyanagi Motohiko
Department of Chemistry, Faculty of Science, Kyushu University
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Miyata Kaori
Department of Chemistry, Faculty of Science, Kyushu University
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