Abstract
THE complexes, [M(NH3)5H2O]X3 and [M(NH3)4− (H2O)2]X3, where X = Cl, Br, I, NO3, etc. ; and M = Co3+, Cr3+, Rh3+, etc., are unstable with respect to the deaquation reactions : 
In the solid-state, this deaquation takes place slowly at room temperature but proceeds very rapidly from 80° to 100° C. While this deaquation, or anation reaction1, has been extensively examined in solution, the solid-state deaquation reaction has received little attention other than several kinetics and thermal stability studies2–8. This is to be expected, of course, because the solid-state allows few variable experimental parameters, among them being temperature.
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References
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Ref. 1, 103.
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SMITH, J., WENDLANDT, W. Mechanism of the Thermal Deaquation of Some Transition Metal Aquoammine Complexes. Nature 201, 291–292 (1964). https://doi.org/10.1038/201291a0
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DOI: https://doi.org/10.1038/201291a0
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