Rate of dissociation constant

Rinsing the sensor surface with buffer results in an irreversible dissociation, because all molecules which dissociate from immobilized protein are removed from the system by the buffer stream, allowing one to determine the rate constant of dissociation separately. 

FIGURE 3.2. Variation of the rate constants of dissociative electron transfer from aromatic anion radicals to butyl and benzyl halides as a function of steric hindrance. Data points from reference 10. Solid lines, best-fit parabola dashed lines, prediction of the Morse curve model, logAf-1 s-1). Adapted from Figure 3 of reference 6b, with permission from the American Chemical Society. 

Electroreduction of Cd(II)-nitrilotriace-tic acid and Cd(II)-aspartic acid systems was studied on DME using SWV [73]. The CE mechanism in which the chemical reaction precedes a reversible electron transfer was established. Also, the rate constants of dissociation of the complexes were determined. Esteban and coworkers also studied the cadmium complexes with nitrilotriacetic acid [74, 75] and fulvic acid [76]. The complexation reaction of cadmium by glycine was investigated by different electrochemical methods using HMDE and mercury microelectrode [77, 78]. 

Jigger and Li [60] have discovered that the transition zone is located at 673 K, and the effective rate constant of dissociation equals ... 

In principle, dimerization is reversible and the equilibrium is rapidly established. The equilibrium concentration of radical ions derived from vinyl monomers is so small that it cannot be detected by ESR (for monomer concentrations 10-1 mol dm-3 it is < 10-7 mol dm-3). The rate constant of dissociation of the dimeric dianion of a-methylstyrene (aMeS)... 

Since the rate constant of dissociation (k fl), rather than the rate constant for association, is the primary determinant of differences in the Kd, we determined the apparent k ff for each of the antibodies. The antibody (1E3) with the lowest apparent koff, and therefore, presumably the lowest Kj, was chosen for further study with the triple mutant K138C, R4A, L6A. 

The factors that affect the fluorescence quantum yield (0p) are (1) the excitation wavelength (kex), the short wavelengths break bonds and increase the rate constant of dissociation processes, the most common excitation wavelength are involving the n —> Jt and re —> 7t ... 

Activation and subsequent redissociation are also possible. Owing to the different starting points (molecules A in dissociation, B -f- C in recombination) different populations of internal energy levels occur during dissociation and recombination. It is, therefore, an interesting question whether the overall rate constants of dissociation and recombination analogous to equation (1.11) are related by the equilibrium constants (see sections 1.6-1.8). 

The polymer-nitroxyl adduct P-X reversibly dissociates thermally, in process 1 into the polymer radical P and the nitroxyl radical X. The rate constants of dissociation and combination are and kc, respectively. The, so-called, degenerative transfer takes place in process 11. The second-order rate constant for active species in either direction is k y. Here all the rate constants are assumed to be independent of chain length. Since the frequency of cleavage of the P-X bond is proportional to [P-X] in process 1 and to [P l [P -X]] in process 11, the overall frequency,/ per unit time and per unit volume, of the bond-cleaving or activation reactions, may be expressed by [277] ... 

The expressions for the rate constants of dissociation and desorption in the transition state are... 

The rate constants of dissociation of organic acids and of redox reactions were determined by this method. The method makes it possible to measure times of chemical relaxation to lO" s. 

The rate of ICAR ATRP is catalyst concentration- and structure-independent. It is determined by the concentration of radicals, which in turn depends on the concentration of radical source (initiator, in) and the rate constant of its decomposition (which is temperature-dependent). The steady-state radical concentration, assuming slow radical generation, is given by eqn (8.25), where k iss is the rate constant of dissociation (decomposition) of the radical source. Values of ktemperature dependence for various radical initiators are collected in several sources. ... 

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