Rate constants and activation parameters for

It is known that the penultimate unit influences the conformation of both model radicals and propagating radicals.32 3 Since addition requires a particular geometric arrangement of the reactants, there are enthalpic barriers to overcome for addition to take place and also potentially significant effects on the entropy of activation. Comparisons of the rate constants and activation parameters for homopropagation with those for addition of simple model radicals to the same monomers also provide evidence for significant penultimate unit effects (Section 4.5.4). 

Rate Constants and Activation Parameters for the Non-enzymic Hydrolysis of D-Glucopyranoside at pH 5... 

Table 3. Rate constants and activation parameters for the LS HS and HS LS unimolecular spin-state interconversions in iron(II) complexes...

Table 4 Rate Constants and Activation Parameters for Alkylchlorocarbene Rearrangements at 25 C in Isooctane0...

Rate Constants and Activation Parameters for Solvent Exchange on [M(solvent) ]3+... 

Rate Constants and Activation Parameters for Axial and Equatorial Solvent Exchange on First-Row Transition... 

Effect of Non-leaving Ligand on the Rate Constants and Activation Parameters for Water Exchange on Gd3+ and Eu2+... 

Rate Constants and Activation Parameters for DMF Exchange on [Ln(DMF)8]3+ complexes... 

Table 11.3 Rate constants and activation parameters for additions of alkyl radicals to propadiene (la) [27],...

TABLE 4. Rate constants and activation parameters" for the reaction6 of p-methoxydiphenylcarbe-nium tetrachloroborate with various dienes... 

The rate constants and activation parameters for a series of Co(III)-Ru(II) complexes separated by Gly, Phe, Pro, and GlyGly, GlyPhe, ProPro are shown in Table I. This series of rate constants is compared to the rate constant and activation parameters for the parent compound (III) with an isonicotinate bridging ligand. In the parent compound III, the ligands around... 

Table 4.15 Rate Constants and Activation Parameters for Ligand Exchange of MfPPhjljBrj in CDCI3 at...

Rate constants and activation parameters for 6 interconversion for the chelate rings in [Fe(CN)4(diamine)] anions with diamine = 1,2-ethanediamine, (2R,35)-butanediamine, and R,2S -di-cyclohexanediamine have been determined from line shape analysis of variable temperature NMR spectra. AH values are 25 kJmoN, 30kJ mol , and 43 kJ mol , values 0 J K mol , -3 J K ... 

In solution, rate constants and activation parameters for dynamic processes can be estimated by direct analysis of the change of the NMR signal shape as a function of temperature. This technique is called line shape analysis (LSA) and it is best suited vhen the rate of exchange ranges from ca. 10 to 10 s" [142, 159]. 

Table 2. Rate Constants and activation parameters for the thermolysis of azoalkanes R R R C—N=)2 20 in hydrocarbon solvents...

For isolated HEI such as dioxetanes and other cyclic and linear peroxides that act directly as reagents in the excitation step, kinetic studies lead to rate constants and activation parameters for this excitation step and conclusions with respect to the mechanism of chemiexcitation can be obtained from the structural and conditional dependence of these parameters. For complex CL systems, in which the HEI is formed in rate-limiting steps prior to the excitation step, the kinetic parameters of this essential reaction step can only be obtained indirectly (see below). 

Values of rate constants and activation parameters for the V02+, Ti02+ and Mo4+ reactions with NCS- are quite similar. The same mechanism has been proposed for the exchange of CF3COi" with [Mo2(02CCF3)4] in acetonitrile from studies using 19N NMR spectroscopy.32... 

Verdazyls (111) can also transfer an electron to o -quinones to give the verdazylium cation (113) and a semiquinone anion (114) (80IZV2785), or to tetranitromethane to give the cation (113) and the tetranitromethane anion radical (115) (74MI22100). Rate constants and activation parameters for the electron transfer from triphenylverdazyl to tetracyanoethylene have been determined by Soviet chemists (79ZOR2344). 

Table 3 Rate Constants and Activation Parameters for the Exchange of the Neutral Ligand, L, in the Reaction3 [MX5L] + L - [MX5 L] + L...

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