Bulletin of the Chemical Society of Japan
Online ISSN : 1348-0634
Print ISSN : 0009-2673
ISSN-L : 0009-2673
Thermal Decomposion Reactions of Chromium(III) Complexes. Hexammine, Chloropentammine and cis-Dichlorotetrammine Complexes
Nobuyuki TanakaKenzo Nagase
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1969 Volume 42 Issue 10 Pages 2854-2857


The thermal decomposition reactions of [Cr(NH3)6]Cl3, [CrCl(NH3)5]Cl2 and cis-[CrCl2-(NH3)4]Cl in solid state were studied by the manometric, infrared spectroscopic and reflectance spectroscopic methods. The decomposition of these complexes in vacuum was initiated by substitution of an outer-sphere chloride ion for a coordinated ammonia. The rate constants, activation energies and activation entropies of these substitution reactions were obtained and the possible reaction processes were discussed. The products cis,cis-[CrCl3(NH3)3] and cis,trans-[CrCl3(NH3)3] were obtained on the heating of cis-[CrCl2(NH3)4]Cl.

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