Reactions of polypyridylchromium(II) ions with oxygen: determination of the self-exchange rate constant of oxygen O2/O2-

1988 ◽  
Vol 110 (15) ◽  
pp. 5059-5063 ◽  
Author(s):  
Khurram. Zahir ◽  
James H. Espenson ◽  
Andreja. Bakac
Keyword(s):  
Exchange Rate ◽  
Rate Constant ◽  
The Self ◽  
Oxygen Determination ◽  
Exchange Rate Constant

Determination of the Self-Exchange Rate Constant for Rusticyanin from Thiobacillus ferrooxidans and a Comparison with Values for Other Type 1 Blue Copper Proteins

1995 ◽  
Vol 34 (21) ◽  
pp. 5370-5374 ◽  
Author(s):  
Panayotis Kyritsis ◽  
Christopher Dennison ◽  
W. John Ingledew ◽  
William McFarlane ◽  
A. Geoffrey Sykes
Keyword(s):  
Exchange Rate ◽  
Rate Constant ◽  
Thiobacillus Ferrooxidans ◽  
The Self ◽  
Copper Proteins ◽  
Blue Copper Proteins ◽  
Blue Copper ◽  
Exchange Rate Constant

Cobalt, Iron and Ruthenium Complexes of Picolinic and Dipicolinic Acids: Syntheses, Solution Properties and Kinetics of Electron Transfer Reactions With Cytochrome C(II) and Some Inorganic Reductants

1989 ◽  
Vol 42 (1) ◽  
pp. 1 ◽  
Author(s):  
RM Ellis ◽  
JD Quilligan ◽  
NH Williams ◽  
JK Yandell
Keyword(s):  
Exchange Rate ◽  
Cytochrome C ◽  
Rate Constant ◽  
Order Rate Constant ◽  
The Self ◽  
Transfer Reactions ◽  
Solution Properties ◽  
Cobalt Iron ◽  
Exchange Rate Constant ◽  
Kinetics Of

Tris picolinate complexes of CO111 and RU111 have been synthesized, and their standard potentials measured (432 �10, 403 �2 mV) at 25�C and ionic strength 0.1 mol dm-3. The self-exchange rate constant of Ru ( pic )3O/- was found to be (1 .4 �0.9)×108 dm3 mol-1 s-l, from reaction with cytochrome C(II), Co( bpy )32+ and ~Co( phen )32+. For the reaction between Fe( dipic )2- and cytochrome ~(II), at 2S260C, pH 5.5 and I 0.1 mol dm-3 (KNO3), the second-order rate constant was (3.2 �0.l)×105 dm3 mol-1 s-1,with ΔH+ 19.9 �0.9 kJ mol-1 and ΔS+ -72.8 �.7 J K-1 mol-l. The self-exchange rate constant of Fe( dipic )2-/2- was reevaluated as (5.8 �0.2)×106 dm3 mol-l s-1.

Electron transfer in non-oxovanadium(IV) and (V) complexes: Kinetic studies of an amavadin model

2009 ◽  
Vol 81 (7) ◽  
pp. 1241-1249 ◽  
Author(s):  
Jeremy M. Lenhardt ◽  
Bharat Baruah ◽  
Debbie C. Crans ◽  
Michael D. Johnson
Keyword(s):  
Electron Transfer ◽  
Exchange Rate ◽  
Rate Constant ◽  
Exchange Process ◽  
Kinetic Studies ◽  
Electron Transfer Reaction ◽  
The Self ◽  
Synthetic Analog ◽  
Vanadium Complex ◽  
Exchange Rate Constant

Electron-transfer reactions of the eight-coordinate vanadium complex, bis-(N-hydroxyiminodiacetate)vanadium(IV) [V(HIDA)2]2–, a synthetic analog of amavadin with ascorbic acid and hexachloroiridate(IV), have been studied. The self-exchange rate constant for this analog has been calculated from oxidation and reduction cross-reactions using Marcus theory and directly measured using 51V NMR paramagnetic line-broadening techniques. The average self-exchange rate constant for the bis-HIDA vanadium(IV/V) couple equals 1.5 × 105 M–1 s–1. The observed rate enhancements are proposed to be due to the small structural differences between the oxidized and reduced forms of the HIDA complex and inner-sphere reorganizational energies. The electron-transfer reaction of this synthetic analog is experimentally indistinguishable from amavadin itself, although significant differences exist in the reduction potential of these compounds. This suggests that ligand modification effects the thermodynamic driving force and not the self-exchange process.

scholarly journals Direct measurement of the self-exchange rate of stellacyanin by a novel e.p.r. method

1984 ◽  
Vol 218 (2) ◽  
pp. 609-614 ◽  
Author(s):  
S Dahlin ◽  
B Reinhammar ◽  
M T Wilson
Keyword(s):  
Exchange Rate ◽  
Exchange Reaction ◽  
Direct Measurement ◽  
Rate Constant ◽  
Close Agreement ◽  
Direct Methods ◽  
The Self ◽  
Blue Copper Protein ◽  
Copper Protein ◽  
Exchange Rate Constant

A method for reconstituting the blue copper protein stellacyanin with the stable copper isotopes 63Cu and 65Cu is reported. Small differences in the e.p.r. spectra of the two isotopic forms of stellacyanin have been used to monitor the electron self-exchange reaction of stellacyanin by rapid-freeze e.p.r. methods. The self-exchange rate constant (k11) for stellacyanin has been determined as 1.2 × 10(5) M-1 X S-1 at 20 degrees C. This value is in close agreement with values obtained from less-direct methods.

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