Effects of phenyl groups on thermodynamic parameters of lanthanoid(III) complexation with aromatic carboxylic acids.
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概要
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The enthalpy changes as well as the stability constants of the complexes between a series of lanthanoid(III) cations and phenylacetate, 3-phenylpropionate, and salicylate ions have been measured using a potentiometer and an isothermal calorimeter, respectively. The data were compared with the data with benzoate ions. The enthalpy changes for formation of the heavier lanthanoid(III) complexes are larger than those for the complexation of the lighter lanthanoids. Also, the complexation heat changes by the carboxylate ions having methylene group(s) between the carboxyl and the phenyl groups are more endothermic than by the anions in which these two groups are joined directly. The results are explained in terms of the differences in the dehydration of the lighter lanthanoid(III) from that of the heavier ones upon complexation and also the different basicities of the carboxylate ions of the ligands.
- 公益社団法人 日本化学会の論文
著者
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HASEGAWA Yuko
Department of Bioresources Science, Faculty of Agriculture, Kochi University
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Choppin Gregory
Department Of Chemistry And Biochemistry Florida State University
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Yamazaki Nobuhiko
Department of Chemistry, Science University of Tokyo
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Usui Satoko
Department of Chemistry, Science University of Tokyo
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Choppin Gregory
Department of Chemistry, The Florida State University
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