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Kinetics of base hydrolysis of tris ‐(1,10‐phenanthroline)iron(II) and of solvolysis of cis ‐dichlorobis(1,2‐ethanediamine)cobalt(III) in water + diol mixtures
Author(s) -
Alshehri S.,
Burgess J.
Publication year - 1993
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.550250207
Subject(s) - chemistry , solvolysis , reactivity (psychology) , hydroxide , hydrolysis , cobalt , aqueous solution , reaction rate constant , inorganic chemistry , phenanthroline , chloride , methanol , base (topology) , medicinal chemistry , kinetics , organic chemistry , medicine , mathematical analysis , physics , alternative medicine , mathematics , pathology , quantum mechanics
Rate constants for base hydrolysis of the tris ‐(1,10‐phenanthroline)iron(II) cation and for solvolysis of the cis ‐dichlorobis(1,2‐ethanediamine)cobalt(III) cation have been measured in binary aqueous mixtures containing 1,2‐ethanediol, 1,2‐ or 1,4‐butanediol, 1,2‐ or 1,6‐hexanediol, 1‐propanol, or t ‐butyl alcohol, at 298.2 K. Kinetics of base hydrolysis of the cobalt(III) complex have also been monitored in methanol‐water and ethanol‐water mixtures, again at 298.2 K. The observed reactivity trends are discussed in terms of the hydrophilic and hydrophobic properties of the respective diols. The dominant factor determining reactivity is hydration of the attacking hydroxide or leaving chloride, as is evidenced by the close correspondence between rate constants and transfer chemical potentials for these anions. The role of hydration has also been probed through the determination of activation volumes for these two reactions in 60% 1,4‐butanediol. © 1993 John Wiley & Sons, Inc.