Abstract
Thermal dehydration of lanthanide hexacyanocobaltate (III) hydrates Ln[Co(CN)6]·nH2O where Ln=La∼Lu except Pm, n=5 for La and Ce, n=4 for Pr∼Lu was investigated by TG-DTA, X-ray powder diffraction analysis and IR spectroscopy. The dehydration of the complexes occurred in multiple steps. The coordinated water were lost first, followed by the dehydration of lattice waters.
The features of the dehydration modes, which were very caracteristic of Ln, was explained by a proper combination of two factors (changes in size and effective charge of Ln) coming from the lanthanide contraction.
