Abnormal hyperchromism of the n.RAR..PI.* absorption band of acetone in protic solvents.
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概要
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Concentration dependence (1–10<SUP>−4</SUP> molar fraction) of the UV absorption spectra of the binary mixtures of (i) acetone–water, (ii) acetone–ethanol, and (iii) diisobutyl ketone–ethanol systems was studied. In (i) and (ii) distinct spectral changes of three steps were observed in succession, while in (iii) gradual changes in two steps were observed. The intensities of the n→π<SUP>*</SUP> band of very dilute solutions for these systems are enhanced, respectively, by 40, 20, and 15 per cent. The results were interpreted as the following stepwise equilibria<BR>A+B\rightleftarrowsAB, AB+B\rightleftarrowsAB<SUB>2</SUB>, AB<SUB>2</SUB>+B\rightleftarrowsAB<SUB>3</SUB><BR>for (i) and (ii), while in (iii) the last step is obscured, where A and B denote, respectively, ketone and water or ethanol molecules. The structure of AB<SUB>3</SUB> is discussed.
- 公益社団法人 日本化学会の論文
著者
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Hosoya Haruo
Department Of Chemistry Faculty Of Science Ochanomizu University
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Yudasaka Masako
Department of Applied Chemistry, Faculty of Engineering, Yokohama National University
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Yudasaka Masako
Department of Chemistry, Faculty of Science, Ochanomizu University
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