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Studies on the interaction between lanthanide ions and ligands, in solid complexes of lanthanide hexacyanometalates. Part II. The kinetics of thermal dehydration of lanthanide hexacyanocobaltate (III) hydrates, Ln[Co(CN)6]·nH2O and yttrium hexacyanocobaltate (III) tetrahydrates |
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| Authors: | Yoshio Masuda Kouichi Kikuchi Yasuhiko Yukawa Hiroshi Miyamoto |
| Affiliation: | a Department of Environmental Science, Faculty of Science, Niigata University, Niigata 950-21, Japan b Department of Chemistry, Faculty of Science, Niigata University, Niigata 950-21, Japan c Department of Chemistry, Faculty of Education, Niigata University, Niigata 950-21, Japan |
| Abstract: | Series complexes of lanthanide hexacyanocobaltates (III), LnCo(CN)6]·nH2O (Ln=lanthanide ions; n=5,4) and yttrium hexacyanocobaltates (III) tetrahydrate were prepared, and the kinetics of the thermal dehydrations of these hydrates was studied. The dehydrations of LnCo(CN)6]·5H2O (Ln=La to Nd) took place through at least three stages, and those of LnCo(CN)6]·4H2O (Ln=Ce to Lu, and Y) through at least two stages. The each dehydration stage was found to be described as a first order reaction, F1. Activation energy for each stage was determined on the basis of thermogravimetry. The relationship between the activation energy for the each dehydration stages and the thermal stability of the series hydrates which was changing with the decrease of the ionic radii of lanthanide ions, was discussed. |
| Keywords: | Thermal dehydration Kinetics Lanthanide hexacyanocobaltates (III) hydrates Crystal structure |
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