Fe(CN)6 3−/Fe(CN)6 4− redox in the interlayer determined by the charge density of Zn n Cr-layered double hydroxides

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    • Abstract:
      Abstract: Redox of Fe(CN)6 3− and Fe(CN)6 4− in the ZnCr layered double hydroxide interlayer has been investigated. The conversion from Fe(CN)6 3− to Fe(CN)6 4− or from Fe(CN)6 4− to Fe(CN)6 3− in the ZnCr-LDH interlayer has been confirmed, depending on the Zn:Cr molar ratio. Both Fe(CN)6 3− and Fe(CN)6 4− are observed in all samples no matter whether the initial anion is Fe(CN)6 3− or Fe(CN)6 4− before precipitation. Deconvolution of the FTIR band around 2100cm−1 reveals that the relative amount of Fe(CN)6 4− and Fe(CN)6 3− in the LDH interlayer is considerably dependent on the Zn:Cr molar ratio. In brief, Fe(CN)6 4− is preferred at the ratio of 2:1 while there is more Fe(CN)6 3− in the ratio of 4:1. Therefore, it is our hypothesis that the charge density of the hydroxide layer is a key factor that directs the redox of Fe(CN)6 3−/Fe(CN)6 4−. The possible redox processes have also been proposed. [Copyright &y& Elsevier]
    • Abstract:
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