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

Published monthly
 

Kinetics of the substitution reactions of chromium(III) complexes. III. The solvation of the trans-dithiocyanatobis(ethyl-enediamine)chromium(III) ion

V. Holba

Komensk√Ĺ University, Bratislava

 

Abstract:  Kinetics of the solvation of trans-[Cr(SCN)2-(en)2]+ ion in 0.01M HNO3 at 50° was studied by a spectro-photometric method. From the change of the absorption spectra at 520 mμ in relation to time (0-150 min.) and from the change of pH from 2.0 to 2.41, it was detd. that the solvation occurs in 2 steps. The reaction scheme may be expressed as: [Cr-(SCN)2(en)2]+ + 2H2O k1 → [Cr(SCN)2(H2O)2en]+ + en (1) and [Cr(SCN)2(H2O)2en]+ + H2O k2 → [CrSCN(H2O)3en]2+ + SCN-(2), where k1 > k2. In reaction 1 there is a substitution of the ethylenediamine with H2O, which is liberated. The velocity const. is k1 = 5.3 × 10-3/min. The activation energy is EA = 24.4 kcal./mol. In reaction 2, SCN- is liberated and the velocity const. is k2 = 2.4 × 10-4/min.

Full paper in Portable Document Format: 196a441.pdf (in Slovak)

 

Chemical Papers 19 (6) 441–446 (1965)

Monday, June 17, 2024

IMPACT FACTOR 2021
2.146
SCImago Journal Rank 2021
0.365
SEARCH
Advanced
VOLUMES
European Symposium on Analytical Spectrometry ESAS 2022
© 2024 Chemical Papers