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    Title: Determination of the pKa of Benzophenones by Capillary Zone Electrophoresis
    Authors: Shiung, Yuan?Chi;Chen, Chih?Yu;Wu, Jong?Chang;Chang, Shu?Wen;Lin, Chen?Hsing
    Contributors: 輔英科技大學 應用化學及材料科學系
    Keywords: Spiropyran;β-cyclodextrin polymer;Response surface methodology;Quantum chemistry calculation
    Date: 2017-12-21
    Issue Date: 2018-09-03 17:02:17 (UTC+8)
    Abstract: Electrophoretic behavior of seven benzophenones as a function of the buffer pH was investigated, and their pKavalues were determined by capillary zone electrophoresis. The determination of pKa?allows us to rationalize the influence of the buffer pH on the migration behavior of benzophenones. The results reveal that both the presence of intramolecular hydrogen bond and the favorable π?electronic delocalization decrease the degree of the acid dissociation of the hydroxyl groups of hydroxybenzophenones. However, the introduction of a hydroxyl group at the 4?position or at the 2′?position of the aromatic ring of hydroxybenzophenones would decrease greatly their pKa1?values. Thus the presence of this type of hydrogen bonding also plays an important role in the acid dissociation of these hydroxybenzophenones.
    Relation: Journal of the Chinese Chemical ,Volume65, Issue4 , April 2018, Pages 465-471
    Appears in Collections:[Department of Applied Chemistry and Materials Science] Journal Article

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