caa a22 4500 445328517 CHVBK 20180317142729.0 cr unu---uuuuu 170323e20110501xx s 000 0 eng 10.1007/s10953-011-9687-1 doi (NATIONALLICENCE)springer-10.1007/s10953-011-9687-1 Dynamics of Hydration of Alkylsulfonate Anions in Aqueous Solutions [Elektronische Daten] [Shoichi Okouchi, Pariya Thanatuksorn, Shiego Ikeda, Hisashi Uedaira] The 17O-NMR spin-lattice relaxation times (T 1) of water molecules in aqueous solutions of n-alkylsulfonate (C1 to C6) and arylsulfonic anions were determined as a function of concentration at 298K. Values of the dynamic hydration number, $(\mathrm{S}^{-}) = n_{\mathrm{h}}^{ -} (\tau_{\mathrm{c}}^{-} /\tau_{\mathrm{c}}^{0} - 1)$ , were determined from the concentration dependence of T 1. The ratios ( $\tau_{\mathrm{c}}^{ -}/\tau_{\mathrm{c}}^{0}$ ) of the rotational correlation times ( $\tau_{\mathrm{c}}^{ -} $ ) of the water molecules around each sulfonate anion in the aqueous solutions to the rotational correlation time of pure water ( $\tau_{\mathrm{c}}^{0}$ ) were obtained from the n DHN(S−) and the hydration number ( $n_{\mathrm{h}}^{ -} $ ) results, which was calculated from the water accessible surface area (ASA) of the solute molecule. The $\tau_{\mathrm{c}}^{ -}/\tau_{\mathrm{c}}^{0}$ values for alkylsulfonate anions increase with increasing ASA in the homologous-series range of C1 to C4, but then become approximately constant. This result shows that the water structures of hydrophobic hydration near large size alkyl groups are less ordered. The rotational motions of water molecules around an aromatic group are faster than those around an n-alkyl group with the same ASA. That is, the number of water-water hydrogen bonds in the hydration water of aromatic groups is smaller in comparison with the hydration water of an n-alkyl group having the same ASA. Hydrophobic hydration is strongly disturbed by a sulfonate group, which acts as a water structure breaker. The disturbance effect decreases in the following order: $\mbox{--} \mathrm{SO}_{3}^{-} > \mbox{--} \mathrm{NH}_{3}^{ +} > \mathrm{OH}> \mathrm{NH}_{2}$ . The partial molar volumes and viscosity B V coefficients for alkylsulfonate anions are linearly dependent on their n DHN(S−) values. Springer Science+Business Media, LLC, 2011 NMR nationallicence Sulfonate anion nationallicence Dynamic hydration number nationallicence $\tau_{\mathrm{c}}^{ -} /\tau_{\mathrm{c}}^{0}$ nationallicence Okouchi Shoichi Department of Materials Chemistry, Faculty of Engineering, Hosei University, 3-7-2 Kajino, Koganei, 184-8584, Tokyo, Japan aut Thanatuksorn Pariya Department of Materials Chemistry, Faculty of Engineering, Hosei University, 3-7-2 Kajino, Koganei, 184-8584, Tokyo, Japan aut Ikeda Shiego Department of Materials Chemistry, Faculty of Engineering, Hosei University, 3-7-2 Kajino, Koganei, 184-8584, Tokyo, Japan aut Uedaira Hisashi Department of Materials Chemistry, Faculty of Engineering, Hosei University, 3-7-2 Kajino, Koganei, 184-8584, Tokyo, Japan aut Journal of Solution Chemistry Springer US; http://www.springer-ny.com 40/5(2011-05-01), 775-785 0095-9782 40:5<775 2011 40 10953 https://doi.org/10.1007/s10953-011-9687-1 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10953-011-9687-1 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Okouchi Shoichi Department of Materials Chemistry, Faculty of Engineering, Hosei University, 3-7-2 Kajino, Koganei, 184-8584, Tokyo, Japan aut NATIONALLICENCE 700 1- Thanatuksorn Pariya Department of Materials Chemistry, Faculty of Engineering, Hosei University, 3-7-2 Kajino, Koganei, 184-8584, Tokyo, Japan aut NATIONALLICENCE 700 1- Ikeda Shiego Department of Materials Chemistry, Faculty of Engineering, Hosei University, 3-7-2 Kajino, Koganei, 184-8584, Tokyo, Japan aut NATIONALLICENCE 700 1- Uedaira Hisashi Department of Materials Chemistry, Faculty of Engineering, Hosei University, 3-7-2 Kajino, Koganei, 184-8584, Tokyo, Japan aut NATIONALLICENCE 773 0- Journal of Solution Chemistry Springer US; http://www.springer-ny.com 40/5(2011-05-01), 775-785 0095-9782 40:5<775 2011 40 10953 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer