• NO$^−_2$ and SCN$^−$-intercalated layered double hydroxides: structure and orientation of anions in the interlayer gallery

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    • Keywords

       

      Nitrite ion; thiocyanate ion; layered double hydroxide; structure refinement.

    • Abstract

       

      NO$^−_2$ and SCN$^−$ are two common small inorganic anions. The former is a common industrial pollutant. Thelatter is linear and is a good mimic for the toxic CN$^−$ ion. The structures of these two anions are refined within the gallery ofthe [Zn–Al]-layered double hydroxide (LDH). Both LDHs crystallize as mixed anion phases. The nitrite is found to co-existwith the nitrate ion. The nitrite ion is intercalated with its molecular plane inclined to the metal hydroxide layer. In the caseof the SCN$^−$ intercalated LDH, no other anion was detected by ion chromatography, suggesting that the SCN$^−$ deficiencyis compensated by intercalated hydroxyl ions. In this case, the SCN$^−$ ion is found to be intercalated with its molecular axisinclined to the metal hydroxide layer.

    • Author Affiliations

       

      SHIVANNA MARAPPA1 P VISHNU KAMATH1

      1. Department of Chemistry, Central College, Bangalore University, Bangalore 560 001, India
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