Chemical kinetics, also known as reaction kinetics, is the study of rates of chemical processes. Chemical kinetics includes investigations of how different experimental conditions can influence the speed of a chemical reaction and yield information about the reaction's mechanism. Relatively simple rate laws exist for zero order reactions (for which reaction.

The phthalimide N-oxyl (PINO) radical was generated by the oxidation of N-hydroxyphthalimide (NHPI) with Pb(OAc) 4 in acetic acid. The molar absorptivity of PINO • is 1.36 × 10 3 L mol - 1 cm - 1 at λ max 382 nm. The PINO radical decomposes slowly with a second-order rate constant of 0.6 ± 0.1 L mol - 1 s - 1 at 25 °C. The reactions of PINO • with substituted toluenes, benzaldehydes, and benzyl alcohols were investigated under an argon atmosphere.

The second-order rate constants were correlated by means of a Hammett analysis. The reactions with toluenes and benzyl alcohols have better correlations with σ + (ρ = −1.3 and −0.41), and the reaction with benzaldehydes correlates better with σ (ρ = −0.91). The kinetic isotope effect was also studied and significantly large values of k H/ k D were obtained: 25.0 ( p-xylene), 27.1 (toluene), 27.5 (benzaldehyde), and 16.9 (benzyl alcohol) at 25 °C. From the Arrhenius plot for the reactions with p-xylene and p-xylene- d 10, the difference of the activation energies, E a D − E a H, was 12.6 ± 0.8 kJ mol - 1 and the ratio of preexponential factors, A H/ A D, was 0.17 ± 0.05. These findings indicate that quantum mechanical tunneling plays an important role in these reactions.

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The sulfur-bridged dimeric dithiolato rhenium(V) chelate ( D), derived from 2-mercaptothiophenol, was monomerized to give ( M− L) in benzene upon reaction with various neutral and anionic monodentate ligands ( L) such as pyridine and its substituted derivatives, triarylphosphines, dimethyl sulfoxide, 4-picoline- N-oxide, and halide ions. The kinetic observations can readily be interpreted for all ligands by a unified mechanism in which the initial fast formation of a 1:1 ( DL) and 1:2 ( DL 2) adduct is followed by the slow monomerization of each species so formed. The use of different ligands gave insight into different steps of the same multistep mechanism. The kinetics of ligand exchange between free L and the monomeric complexes was also studied; an associative pathway has been proposed to interpret the results. The crystal structures of two new monomeric ML complexes (with L = 4-acetylpyridine and 1,3-diethylthiourea) are reported.