Proton-transferred ion pairs of p-hydroxybenzaldehyde and p-hydroxyacetophenone in ethers at low temperature.

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概要

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• The self-associations of <I>p</I>-hydroxybenzaldehyde (HBA) and <I>p</I>-hydroxyacetophenone (HAP) have been studied from measurements of phosphorescence and the excitation spectra at 77 K. At appropriately high concentrations of HBA and HAP in ethereal matrices, such as 1,4-dioxane, these compounds exhibit dual phosphorescences around 430 and 470 nm with excitation at 290 and 330 nm, respectively. The shorter-wavelength emission is due to monomeric species of the substrates. The longer-wavelength emission can be interpreted as being due to ion pairs, in which the proton of the hydroxyl group of the substrate molecule is transferred intermolecularly to the formyl group of another substrate molecule. The phosphorescence excitation spectra show that the ion pairs are formed in the ground states of the phenolic compounds, being in equilibrium with the monomeric species at 77 K. The ion pair formation is strongly dependent on the medium.

• 公益社団法人 日本化学会の論文

著者

• Okubo Jun

  Department Of Chemistry College Of Science And Engineering Aoyama Gakuin University

• Sakurai Tadamitsu

  Department Of Applied Chemistry Faculty Of Engineering Kanagawa University

• Inoue Hiroyasu

  Department Of Applied Chemistry Faculty Of Technology Kanagawa University

• HOSHI Toshihiko

  Department of Chemistry and Biological Science, College of Science and Engineering, Aoyama Gakuin University

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