Comparison of the Dissolution Behavior in Ethanol with the Dissolution Behavior in Water for Tris(amino acidato)cobalt(III)
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The free energy (Δ<SUB>dis</SUB><I>G</I>°), enthalpy (Δ<SUB>dis</SUB><I>H</I>°), and entropy of dissolution (Δ<SUB>dis</SUB><I>S</I>°) for tris(amino acidato)cobalt(III) were estimated from the temperature dependence of the solubilities in water, aqueous Bu<SUB>4</SUB>NBr solutions, and ethanol. For <I>mer</I>-tris(β-alaninato)cobalt(III) (<I>mer</I>-[Co(β-ala)<SUB>3</SUB>]), <I>mer</I>-(+)-tris(<FONT SIZE="-2">L</FONT>-threoninato)cobalt(III) (<I>mer</I>-(+)-[Co(<FONT SIZE="-2">L</FONT>-thr)<SUB>3</SUB>]), and <I>fac</I>-(−)-tris(<FONT SIZE="-2">L</FONT>-prolinato)cobalt(III) (<I>fac</I>-(−)-[Co(<FONT SIZE="-2">L</FONT>-pro)<SUB>3</SUB>]), Δ<SUB>tr</SUB><I>H</I>° and Δ<SUB>tr</SUB><I>S</I>° of the transfer process from water to Bu<SUB>4</SUB>NBr solutions indicate that these chelates have rather a hydrophilic character. In addition to these chelates, for <I>mer</I>-(−)-tris(<FONT SIZE="-2">L</FONT>-alaninato)cobalt(III) (<I>mer</I>-(−)-[Co(<FONT SIZE="-2">L</FONT>-ala)<SUB>3</SUB>]), <I>mer</I>-(−)- and <I>fac</I>-(−)-tris(<FONT SIZE="-2">L</FONT>-valinato)cobalt(III) (<I>mer</I>-(−)- and <I>fac</I>-(−)-[Co(<FONT SIZE="-2">L</FONT>-val)<SUB>3</SUB>]), <I>mer</I>-(+)-tris(<FONT SIZE="-2">L</FONT>-leucinato)cobalt(III) (<I>mer</I>-(+)-[Co(<FONT SIZE="-2">L</FONT>-leu)<SUB>3</SUB>]), and so on, the dissolution behavior in ethanol was compared with that in water by using Δ<SUB>dis</SUB><I>G</I>°, Δ<SUB>dis</SUB><I>H</I>°, and Δ<SUB>dis</SUB><I>S</I>° in both solvents. The dissolution behavior of these chelates may be divided into two groups, that is, a group composed of hydrophilic chelates and another group composed of hydrophobic chelates. In the former, the solubilities in water are larger than those in ethanol owing to both smaller Δ<SUB>dis</SUB><I>H</I>° and larger Δ<SUB>dis</SUB><I>S</I>° in water. In the latter, the solubilities in ethanol are larger than those in water owing to larger Δ<SUB>dis</SUB><I>S</I>° in ethanol.
- 公益社団法人 日本化学会の論文
公益社団法人 日本化学会 | 論文
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