ISSN print edition: 0366-6352 ISSN electronic edition: 1336-9075 Registr. No.: MK SR 9/7 Published monthly

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)