Proton NMR investigation of the electron-exchange reaction between hexaammineruthenium(II) and hexaammineruthenium(III) ions
Journal Article
·
· Inorg. Chem.; (United States)
The rate of the electron-self-exchange reaction between (Ru(NH/sub 3/)/sub 6/)/sup 3 +/ and (Ru(NH/sub 3/)/sub 6/)/sup 2 +/ has been measured by proton NMR line broadening. The system is complicated by the equation of (Ru(NH/sub 3/)/sub 6/)/sup 2 +/, which results in reduction of the small amount of (Ru(NH/sub 3/)/sub 6/)/sup 3 +/ present. To reduce this difficulty, measurements were performed at 4/sup 0/C. Rate constants are (6.6 +/- 1.0) x 10/sup 3/ and (9.9 +/- 0.2) X 10/sup 3/ M/sup -1/ s/sup -1/ for solutions of 0.125 and 0.250 M (Ru(NH/sub 3/)/sub 6/)Cl/sub 2/, respectively. These rate constants are in order-of-magnitude agreement with those previously reported. The reaction appears to be catalyzed by chloride ion. A rate constant for the uncatalyzed reaction at 4/sup 0/C and an ionic strength approx.0.5 M is estimated to be 3.3 x 10/sup 3/ M/sup -1/ s/sup -1/. The activation enthalpy is about 5 kcal mol/sup -1/.
- Research Organization:
- Univ. of Sydney, Australia
- OSTI ID:
- 5659156
- Journal Information:
- Inorg. Chem.; (United States), Journal Name: Inorg. Chem.; (United States) Vol. 25:13; ISSN INOCA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
AMMINES
CATIONS
CHARGED PARTICLES
CHEMICAL REACTION KINETICS
COMPLEXES
DATA
ELECTRON TRANSFER
ENTHALPY
EXPERIMENTAL DATA
INFORMATION
IONS
KINETICS
MAGNETIC RESONANCE
MEDIUM TEMPERATURE
NMR SPECTRA
NUCLEAR MAGNETIC RESONANCE
NUMERICAL DATA
PHYSICAL PROPERTIES
REACTION KINETICS
RESONANCE
RUTHENIUM COMPLEXES
SPECTRA
THERMODYNAMIC PROPERTIES
THERMODYNAMICS
TRANSITION ELEMENT COMPLEXES
400201* -- Chemical & Physicochemical Properties
AMMINES
CATIONS
CHARGED PARTICLES
CHEMICAL REACTION KINETICS
COMPLEXES
DATA
ELECTRON TRANSFER
ENTHALPY
EXPERIMENTAL DATA
INFORMATION
IONS
KINETICS
MAGNETIC RESONANCE
MEDIUM TEMPERATURE
NMR SPECTRA
NUCLEAR MAGNETIC RESONANCE
NUMERICAL DATA
PHYSICAL PROPERTIES
REACTION KINETICS
RESONANCE
RUTHENIUM COMPLEXES
SPECTRA
THERMODYNAMIC PROPERTIES
THERMODYNAMICS
TRANSITION ELEMENT COMPLEXES