Thermal decomposition of Prussian blue analogues in various gaseous media

Prussian blue analogues with formulae Ni-3[Co(CN)(6)](2)center dot 16H(2)O(I), Cu-3[Co(CN)(6)](2)center dot 17H(2)O(II), Ni-3[Fe(CN)(6)](2)center dot 15H(2)O(III) and Cu-3[Fe(CN)(6)](2)center dot 13H(2)O(IV) have been synthesized. The thermal decomposition of all complexes in oxidizing (air), reducing (hydrogen) and inert (argon) atmospheres was studied in the temperature range from 20 to 1000 degrees C. TG-DSC curves were obtained; analysis of solid thermolysis products was performed. It was established that the decomposition process of all the studied compounds in air ends up to 450-500 degrees C, and mass loss continues up to 1000 degrees C in argon. Solid products of thermolysis are oxides of central ions (NiO, CuO, Co3O4, Fe3O4) in air; mixtures of metals or Ni3Fe (III) in argon; Ni and Co (I) and Ni3Fe + Fe(III), and mixtures of Cu + Co (II) and Cu + Fe(IV) in hydrogen. Hexacyanocobaltates are reduced at lower temperatures and more fully than hexacyanoferrates under the same conditions.

Automated summary

Several Prussian blue analogues with formulae Ni-3[Co(CN)(6)](2)·16H(2)O(I), Cu-3[Co(CN)(6)](2)·17H(2)O(II), Ni-3[Fe(CN)(6)](2)·15H(2)O(III), and Cu-3[Fe(CN)(6)](2)·13H(2)O(IV) were synthesized and studied for their thermal decomposition behavior in different atmospheres. The results showed differences in decomposition temperatures and products under various conditions.