Coenzyme B12 model studies. Equilibriums and kinetics of axial ligation of substituted alkylcobaloximes by pyridine in aqueous solution

1975 ◽  
Vol 97 (25) ◽  
pp. 7338-7346 ◽  
Author(s):  
Kenneth L. Brown ◽  
Douglas Lyles ◽  
Michael Pencovici ◽  
Roland G. Kallen
Keyword(s):  
Aqueous Solution ◽  
Coenzyme B12 ◽  
Model Studies ◽  
Axial Ligation ◽  
Kinetics Of

Coenzyme B12 Model Studies− Kinetics of Axial Ligation of Alkylcobalt Complexes Containing a Tridentate Amino-Oximate Ligand

2003 ◽  
Vol 2003 (20) ◽  
pp. 3738-3744 ◽  
Author(s):  
Basam M. Alzoubi ◽  
Mohamed S. A. Hamza ◽  
Alessandro Felluga ◽  
Lucio Randaccio ◽  
Giovanni Tauzher ◽  
...  
Keyword(s):  
Coenzyme B12 ◽  
Model Studies ◽  
Axial Ligation ◽  
Kinetics Of

Kinetics and mechanism of the reaction of iron(III) with 6-methyl-2,4-heptanedione and 3,5-heptanedione

1990 ◽  
Vol 55 (8) ◽  
pp. 1984-1990 ◽  
Author(s):  
José M. Hernando ◽  
Olimpio Montero ◽  
Carlos Blanco
Keyword(s):  
Aqueous Solution ◽  
Metal Ion ◽  
Activation Parameters ◽  
Enol Form ◽  
Kinetics And Mechanism ◽  
Kinetic Constants ◽  
Steric Factors ◽  
Kinetics Of ◽  
Mechanism Of The Reaction

The kinetics of the reactions of iron(III) with 6-methyl-2,4-heptanedione and 3,5-heptanedione to form the corresponding monocomplexes have been studied spectrophotometrically in the range 5 °C to 16 °C at I 25 mol l-1 in aqueous solution. In the proposed mechanism for the two complexes, the enol form reacts with the metal ion by parallel acid-independent and inverse-acid paths. The kinetic constants for both pathways have been calculated at five temperatures. Activation parameters have also been calculated. The results are consistent with an associative activation for Fe(H2O)63+ and dissociative activation for Fe(H2O)5(OH)2+. The differences in the results for the complexes of heptanediones studied are interpreted in terms of steric factors.

Temperature Effect on the Two-Dimensional Phase Transition Kinetics of Adenine Adsorbed at the Hg Electrode/Aqueous Solution Interface

2003 ◽  
Vol 68 (8) ◽  
pp. 1407-1419 ◽  
Author(s):  
Claudio Fontanesi ◽  
Roberto Andreoli ◽  
Luca Benedetti ◽  
Roberto Giovanardi ◽  
Paolo Ferrarini
Keyword(s):  
Phase Transition ◽  
Aqueous Solution ◽  
Phase Change ◽  
Temperature Effect ◽  
Transition Rate ◽  
Effect Of Temperature ◽  
Two Dimensional ◽  
Solution Interface ◽  
Phase Transition Kinetics ◽  
Kinetics Of

The kinetics of the liquid-like → solid-like 2D phase transition of adenine adsorbed at the Hg/aqueous solution interface is studied. Attention is focused on the effect of temperature on the rate of phase change; an increase in temperature is found to cause a decrease of transition rate.

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