Premium
Medium effects on the initial and the transition states upon the solvolysis of trans ‐dichlorobis( N ‐methyl‐ethylenediamine)cobalt(III) complex in water‐mixed solvents
Author(s) -
ElSubruiti Gehan Moustafa
Publication year - 2002
Publication title -
international journal of chemical kinetics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.341
H-Index - 68
eISSN - 1097-4601
pISSN - 0538-8066
DOI - 10.1002/kin.10072
Subject(s) - chemistry , solvolysis , solvation , cobalt , ethylenediamine , reaction rate constant , solvent , solvent effects , kinetics , transition state , dielectric , inorganic chemistry , organic chemistry , hydrolysis , catalysis , optoelectronics , physics , quantum mechanics
The kinetics of solvolysis of trans ‐dichlorobis( N ‐methylethylenediamine)cobalt(III) complex have been investigated in aqua‐organic solvent media (0–60% (v/v) cosolvent) at 25 ≤ t°C ≤ 60, using n ‐propanol and tert ‐butyl alcohol as cosolvents. The first‐order rate constant increased nonlinearly with the reciprocal of the dielectric constant D s −1 , and x org , reflecting the individuality of the cosolvents and thereby suggesting that the relative stabilities of the transition state and initial state were governed by the preferential solvation effect. The thermodynamic parameters (Δ H ≠ and Δ S ≠ ) were sensitive to the structural changes in the bulk solvent phase. © 2002 Wiley Periodicals, Inc. Int J Chem Kinet 34: 495–499, 2002