Tuning the thermal stability of copper(II) hexacyanoferrate(II)

Micheal P Moloney (1) , Nicolas Massoni (1) , Agnès Grandjean (1)

1 DPME - Département de recherche sur les Procédés et Matériaux pour les Environnements complexes

While it is well recorded that the family of transition metal hexacyanoferrates efficiently, and selectively, extract Cs ions from what should be highly competitive environments, the why of this efficiency is still somewhat unclear. In this work Potassium-Copper (II) Hexacyanoferrate (II), before and after, Cs/K exchange was examined using a number of spectroscopic techniques including solid UV-Vis, FT-IR, TGA, Elemental Analysis, XRD, EXAFs and PDF. Definite long range and local structure changes were observed when Cs was introduced into the Cu-HCF system. Gathering these various spectral observations together we propose a possible Cs sorption mechanism for Cu-HCF in which a type of Jahn-Teller distortion (common within copper complexes) is removed as the Cs is selectively sorped. These spectral changes were not observed when the K+ guest ions were exchanged for H+ ions, adding credence to our believe that the changes are unique to Cs exchange.

Domaines: Chimie inorganique; Matériaux; Chimie de coordination

Micheal P Moloney, Nicolas Massoni, Agnès Grandjean. Tuning the thermal stability of copper(II) hexacyanoferrate(II). Journal of Thermal Analysis and Calorimetry, 2020, 145 (5), https://doi.org/10.1007/s10973-020-09823-4. ⟨10.1007/s10973-020-09823-4⟩. ⟨cea-03561207⟩