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| - Selective Anion-Exchange Properties of Second-Stage LayeredDouble Hydroxide Heterostructures
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| - The anion-exchange properties of second-stage [Zn2Cr(OH)6]Cl0.5(succinate)0.25·nH2O (Zn2Cr-Succ/Cl) and [Zn2Cr(OH)6]Cl0.5(tartrate)0.25·nH2O (Zn2Cr-Tart/Cl) materials were investigated by means oftime-resolved in situ energy-dispersive X-ray diffraction (EDXRD). Selective anion-exchange reactionswere observed that were a result of the segregation between organic and inorganic anions. Indeed, thereaction of Zn2Cr-Succ/Cl and Zn2Cr-Tart/Cl second-stage compounds with either fluoride or adipateanions initially occurs with preferential replacement of the hydrophilic Cl ion with F or replacement ofthe hydrophobic succinate or tartrate anions with adipate; this leads to the formation of new second-stage intermediates Zn2Cr-Succ/F and Zn2Cr-Tart/F or Zn2Cr-Adip/Cl. The formation of such heterostructures offers new perspectives for LDH intercalation chemistry, particularly in the direction ofmultifunctional materials.
- The anion-exchange properties of heterostructural second-stage LDH materials with alternate interlayer spaces occupied by Cl and succinate (or tartarte) anions were investigated. The exchange was found to be highly selective, with new second-stage compounds forming as a result of an organic/inorganic separation.
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