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Kinetics of the substitution of chromium(III) complexes. IV. Aquation of thiocyanatopentaamminechromium(III) and tetrathiocyanatodianilinochromate ions

V. Holba and P. Ševčík

Komenský University Bratislava


Abstract: cf. CA 63, 15621d. Kinetics of the aquation of the thiocyanatopentaamminechromium(III) ions were studied at pH concns. 10-2 to 10-3 and at 70°. By applying heavy water in place of water, the reaction velocity was decreased 10%. For the tetrathiocyanatodianilinochromate ions (I), the observed velocity const. does not depend on pH at the range from 1.0 to 4.0. The aquation of I was studied in the mixts.: H2O-MeOH, H2O-acetone, and H2O-dioxane. The addn. of nonaq. solvents resulted in a decrease of the reaction velocity, showing the lowest value for the dioxane. The mechanism SN1 at the aquation I has a higher probability than SN2.

Full paper in Portable Document Format: 203a161.pdf (in Slovak)


Chemical Papers 20 (3) 161–168 (1966)

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