scholarly journals Stopped flow spectrophotometric observation of superoxide dismutation in aqueous solution

FEBS Letters ◽  
1976 ◽  
Vol 67 (3) ◽  
pp. 294-298 ◽  
Author(s):  
Gregory J. McClune ◽  
James A. Fee
Keyword(s):  
Aqueous Solution ◽  
Stopped Flow ◽  
Spectrophotometric Observation

The mechanism of the oxidation of thiocyanate ion by peroxomonosulphate in aqueous solution. II. Kinetics of the reaction

1966 ◽  
Vol 19 (8) ◽  
pp. 1365 ◽  
Author(s):  
RH Smith ◽  
IR Wilson
Keyword(s):  
Aqueous Solution ◽  
Initial Rate ◽  
Stopped Flow ◽  
Thiocyanate Ion ◽  
First Order ◽  
Conductance Method ◽  
Rate Of Reaction ◽  
Kinetics Of

Initial rates of reaction for the above oxidation have been measured by a stopped-flow conductance method. Between pH 2 and 3.6, the initial rate of reaction, R, is given by the expression R{[HSO5-]+[SCN-]} = {kb+kc[H+]}[HSO5-]0[SCN-]20+ka[H+]-1[HSO5]20[SCN-]0 As pH increases, there is a transition to a pH-independent rate, first order in each thiocyanate and peroxomonosulphate concentrations.

Ligand substitution at five-coordinate copper(II) centres by cyanate, chloride and bromide ions

1980 ◽  
Vol 33 (6) ◽  
pp. 1381 ◽  
Author(s):  
JH Coates ◽  
PR Collins ◽  
SF Lincoln
Keyword(s):  
Aqueous Solution ◽  
Transition State ◽  
Ligand Substitution ◽  
Aqua Ligand ◽  
Stopped Flow ◽  
Bromide Ions ◽  
Ethyl Amine ◽  
Ligand Bond

The substitution of the aqua[tris{2-(dimethylamino)ethyl}amine]copper(II) ion by cyanate, chloride and bromide ions has been studied in aqueous solution by static and stopped-flow spectrophoto-metric techniques. This process is unusually slow for ligand substitution at a copper(II) centre and appears to proceed through an interchange mechanism in which the copper(II)-aqua ligand bond makes a major contribution to the transition state energetics.

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