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Accurate Determination of the Quantity and Spatial Distribution of Counterions around a Spherical Macroion.
Chen, Jiahui; Bera, Mrinal K; Li, Hui; Yang, Yuqing; Sun, Xinyu; Luo, Jiancheng; Baughman, Jessi; Liu, Cheng; Yao, Xuesi; Chuang, Steven S C; Liu, Tianbo.
Afiliação
  • Chen J; School of Polymer Science and Polymer Engineering, The University of Akron, Akron, OH, 44325-3909, USA.
  • Bera MK; NSF's ChemMatCARS, Center for Advanced Radiation Sources, The University of Chicago, Chicago, IL, 60637, USA.
  • Li H; School of Polymer Science and Polymer Engineering, The University of Akron, Akron, OH, 44325-3909, USA.
  • Yang Y; School of Polymer Science and Polymer Engineering, The University of Akron, Akron, OH, 44325-3909, USA.
  • Sun X; School of Polymer Science and Polymer Engineering, The University of Akron, Akron, OH, 44325-3909, USA.
  • Luo J; School of Polymer Science and Polymer Engineering, The University of Akron, Akron, OH, 44325-3909, USA.
  • Baughman J; School of Polymer Science and Polymer Engineering, The University of Akron, Akron, OH, 44325-3909, USA.
  • Liu C; School of Polymer Science and Polymer Engineering, The University of Akron, Akron, OH, 44325-3909, USA.
  • Yao X; School of Polymer Science and Polymer Engineering, The University of Akron, Akron, OH, 44325-3909, USA.
  • Chuang SSC; School of Polymer Science and Polymer Engineering, The University of Akron, Akron, OH, 44325-3909, USA.
  • Liu T; School of Polymer Science and Polymer Engineering, The University of Akron, Akron, OH, 44325-3909, USA.
Angew Chem Int Ed Engl ; 60(11): 5833-5837, 2021 Mar 08.
Article em En | MEDLINE | ID: mdl-33295092
The accurate distribution of countercations (Rb+ and Sr2+ ) around a rigid, spherical, 2.9-nm size polyoxometalate cluster, {Mo132 }42- , is determined by anomalous small-angle X-ray scattering. Both Rb+ and Sr2+ ions lead to shorter diffuse lengths for {Mo132 } than prediction. Most Rb+ ions are closely associated with {Mo132 } by staying near the skeleton of {Mo132 } or in the Stern layer, whereas more Sr2+ ions loosely associate with {Mo132 } in the diffuse layer. The stronger affinity of Rb+ ions towards {Mo132 } than that of Sr2+ ions explains the anomalous lower critical coagulation concentration of {Mo132 } with Rb+ compared to Sr2+ . The anomalous behavior of {Mo132 } can be attributed to majority of negative charges being located at the inner surface of its cavity. The longer anion-cation distance weakens the Coulomb interaction, making the enthalpy change owing to the breakage of hydration layers of cations more important in regulating the counterion-{Mo132 } interaction.
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Texto completo: 1 Base de dados: MEDLINE Idioma: En Ano de publicação: 2021 Tipo de documento: Article

Texto completo: 1 Base de dados: MEDLINE Idioma: En Ano de publicação: 2021 Tipo de documento: Article