Cover Image

Analysis of water molecules exchange mechanism in 3d cation aquacomplex

Viktor O. Sereduyk, Viktor F. Vargaluyk

Abstract


The ligand exchange rate is the significant part of complex compound kinetic. The mechanism of this process may be different. In the article the ability to apply the quantum-chemical method for determination of intermediates type and ligand exchange mechanism have been estimated. Our calculations have shown that the dissociative mechanism of water molecules exchange dominates for the majority of divalent 3d-cations aquacomplexes. It was found that rate of ligand exchange is inversely proportional to the energy logarithm of five intermediate ligand formative as associative mechanisms possible only for Ti2+ aquacomplexes. The associative mechanism is to be place for trivalent cations Ti3+, V3+, Mn3+ and Fe3+ aquacomplexes. Associative compounds of Cr3+ and Co3+ is forbidden and exchange of inner water molecules implement through the complex for such cations dissociative mechanism. This method allow to determine the ligand exchange rate in the complexes which haven’t these values and to estimate the labilite of the short-lived intermediate complexes.


Keywords


aquacomplexes; 3d-cations; exchange rate of ligand; quantum-chemical calculation

References


Gordon, M. S., Schmidt, M. W. Advances in electronic structure theory: GAMESS a decade later, Elsevier, Amsterdam, 2005, p. 1167-1189.

Sereduyk, V. O., Vargaluyk, V. F. Estimation of reliability of quantum-chemical calculations of electronic transitions in aqua complexes of transition metals. Russian Journal of Electrochemistry, 2008, vol. 44, no. 10, p. 1105-1112.

Skopenko, V. V., Savrunski, L. I. Koordynatsiyna khimiya, Кyiv: Lybyd, 1997, 336 p.




DOI: http://dx.doi.org/10.15421/081323

Refbacks

  • There are currently no refbacks.




Creative Commons License
This work is licensed under a Creative Commons Attribution 4.0 International License.

______________________________________________________
BULLETIN OF DNIPROPETROVSK NATIONAL UNIVERSITY
eISSN: 2313-4984 | pISSN: 2306-871X
Contact:chem.dnu@gmail.com
The journal publishes research papers on terms: Creative Commons Attribution 4.0 International License
Founder: Oles Honchar Dnipropetrovsk National University