Thermodynamics of the dissociation of aminomethanesulfonic acid and its N-substituted derivatives in aqueous solutions at 293–313 K
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- 作者：R. E. Khoma
- 关键词：aminomethanesulfonic acids ; aqueous solutions ; thermodynamics of dissociation ; enthalpy–entropy compensation
- 刊名：Russian Journal of Physical Chemistry A
- 出版年：2017
- 出版时间：January 2017
- 年：2017
- 卷：91
- 期：1
- 页码：76-79
- 全文大小：
- 刊物类别：Chemistry and Materials Science
- 刊物主题：Physical Chemistry;
- 出版者：Pleiades Publishing
- ISSN：1531-863X
- 卷排序：91
文摘
ΔG, ΔH, and ΔS of the second dissociation step of aminomethanesulfonic acid and its N-methyl, N-hydroxyethyl, N-(tert-butyl), N-benzyl derivatives in aqueous solutions (at the isoelectric point where the ionic strength is 4.75 × 10–4 М) are determined on basis of pH measurements at 293–313 K. It is found that an increase of the electron-acceptor properties of the substituents at nitrogen atom reduces the effect temperature has on the thermodynamic functions of dissociation. Enthalpy–enthropy compensation at an isothermodynamic temperature of 303 K is recorded.