Bulletin of the Chemical Society of Japan
Online ISSN : 1348-0634
Print ISSN : 0009-2673
ISSN-L : 0009-2673
Formation Constants of Maleatochromium(III) Complexes and Some Properties Thereof in the Solid State
Takeshi TomitaEishin KyunoRyokichi Tsuchiya
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1968 Volume 41 Issue 5 Pages 1130-1132


The formation constants of the chromium(III) complexes with maleic acid have been determined by the pH method to be logk1=5.4±0.1, logk2=3.0±0.1, and logk3=1.9±0.2 at an ionic strength of μ=0.1 and at 25°C. We also attempted to prepare the solid of the chromium(III) complex with maleic acid. Though it was an amorphous solid to X-ray diffraction measurement, its composition was presumed to be [Cr(mal)(OH)(H2O)3]. After it had been dried in a desiccator for a few days, when it was exposed to moist air we observed the curious phenomenon that the solid was made jumping due to the absorption of water vapor.

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