Charge Distribution Controls On‐Target Separation of Low Nucleophilicity Anions in Layered Double Hydroxides

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  • Tomohito Sudare
    Research Initiative for Supra‐Materials (RISM) Shinshu University 4‐17‐1 Wakasato Nagano 380–8553 Japan
  • Shuhei Tamura
    Department of Materials Chemistry Faculty of Engineering Shinshu University 4‐17‐1 Wakasato Nagano 380–8553 Japan
  • Maru Kashiwazaki
    Department of Materials Chemistry Faculty of Engineering Shinshu University 4‐17‐1 Wakasato Nagano 380–8553 Japan
  • Yuki Nakamura
    Department of Materials Chemistry Faculty of Engineering Shinshu University 4‐17‐1 Wakasato Nagano 380–8553 Japan
  • Kenta Kawaguchi
    Department of Materials Chemistry Faculty of Engineering Shinshu University 4‐17‐1 Wakasato Nagano 380–8553 Japan
  • Hiromasa Shiiba
    Research Initiative for Supra‐Materials (RISM) Shinshu University 4‐17‐1 Wakasato Nagano 380–8553 Japan
  • Kazunori Fujisawa
    Research Initiative for Supra‐Materials (RISM) Shinshu University 4‐17‐1 Wakasato Nagano 380–8553 Japan
  • Mongkol Tipplook
    Research Initiative for Supra‐Materials (RISM) Shinshu University 4‐17‐1 Wakasato Nagano 380–8553 Japan
  • Hideki Tanaka
    Research Initiative for Supra‐Materials (RISM) Shinshu University 4‐17‐1 Wakasato Nagano 380–8553 Japan
  • Fumitaka Hayashi
    Department of Materials Chemistry Faculty of Engineering Shinshu University 4‐17‐1 Wakasato Nagano 380–8553 Japan
  • Katsuya Teshima
    Research Initiative for Supra‐Materials (RISM) Shinshu University 4‐17‐1 Wakasato Nagano 380–8553 Japan

Abstract

<jats:title>Abstract</jats:title><jats:p>Host–guest chemistry principles and mechanisms have been exploited to separate harmful and valuable ionic species. However, separating low nucleophilicity anions using these protocols is difficult due to weak host–guest interactions. Herein, using layered double hydroxides (LDHs), it is demonstrated that guest–guest interactions considerably influence the separation of a low nucleophilicity nitrate. LDHs exhibit considerably low nitrate ion storage capacities due to the co‐precipitation synthesis method. Hence, a topochemical reaction is applied to control the cation arrangement in the LDHs. Structural analyses determine that a hexagonal cation arrangement is facilitated. Isotherm analysis reveals that the obtained LDHs improve the capacity up to 250% of that of typical less‐ordered LDHs. Finally, further isotherm analysis in combination with theoretical calculations, it is revealed that the hexagonal arrangement effectively facilitates a stable guest–guest interactions—hydrogen‐bond between the interlayer nitrate ions and water molecules, which contributes to high ion‐storage.</jats:p>

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