Spectroscopic study of 10-benzoyl-9-anthrol and its anion in basic media. An estimation of microscopic polarity of PMMA.
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概要
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The acid-base equilibrium of the title compound (BAOH) was studied in various media containing 4% triethylamine (TEA) by volume as a base. As the polarity of solvents increases, the equilibrium shifts toward the base form (BAO<SUP>−</SUP>) and 100% yield of BAO<SUP>−</SUP> is achieved in solvents with dielectric constant (ε) greater than 20. The equilibrium is also affected by temperature, favoring the base form at lower temperatures. The associated enthalpy change is estimated to be −14.6 kJ mol<SUP>−1</SUP>. Of particular interest is the dominant existence of BAO<SUP>−</SUP> in poly(methyl methacrylate) (PMMA), since the acid form (BAOH) dominates in a monomeric solvent (MMA). The microscopic effective dielectric constant of PMMA is estimated to correspond to that of a solvent with ε=22–30 by comparing spectral data in PMMA with those in various solvents. No base form is formed in polystyrene, indicating that not only rigidity but also polar groups in PMMA may be responsible for the anomalously large dielectric constant of PMMA.
- 公益社団法人 日本化学会の論文
著者
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Hamanoue Kumao
Department Of Chemistry Kyoto Institute Of Technology
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Amano Masayuki
Department Of Materials Science And Engineering Kyoto University
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Nakajima Kazuo
Department Of Electrical Engineering The University Of Maryland
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NAKAYAMA Toshihiro
Department of Chemistry and Materials Technology, Faculty of Engineering and Design, Kyoto Institute of Technology
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Teranishi Hiroshi
Department of Chemistry, Faculty of Technology, Kyoto Institute of Technology
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Hamanoue Kumao
Department of Chemistry, Faculty of Technology, Kyoto Institute of Technology
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Hirayama Satoshi
Faculty of Textile Science, Kyoto Institute of Technology
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Nakayama Toshihiro
Department of Chemistry, Faculty of Technology, Kyoto Institute of Technology
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Nakajima Kazuo
Department of Chemistry, Faculty of Technology, Kyoto Institute of Technology
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