Rate constants have been measured for the reaction of the light hydrogen isotope muonium with benzene and 2,3‐dimethylbutadiene‐1,3 in the gas phase and in several solvents. Comparison with H atom data reveals (1) appreciable kinetic isotope effects, (2) a strong contribution of tunnelling for the activated reaction with benzene, (3) encounter controlled reaction for Mu addition to the diene, (4) a mass dependence of the diffusion constant of hydrogen isotopes in solution, and (5) an enhancement of the rate constant in solution over that in the gas phase by a factor, except for water, of the inverse Ostwald solubility coefficient for hydrogen. The isotope‐dependent reduction of the solvent effect in water is tentatively ascribed to the dynamics of the clathrate‐like structure when the hydrogen atom reacts.
The rate constants for the reaction e^ + EDTA were measured as a function of the pH by the pulse-radiolysis technique. Between pH = 6 and pH = 10 this rate constant can be represented by the equation k = 4.7 X 10 e X (fraction of HEDTA 3 ") + 1.0 X 10* X (fraction Hj EDTA 2 ~)M~1 s" 1 . Also the rate constants for reactions of e^j with the following metal-EDTA complexes were measured: CuEDTA 2 -, HgEDTA 2 CoEDTA 2 ", InEDTA", NiEDTA 2 GaEDTA", MnEDTA 2 ZnEDTA 2 -, CdEDTA 2 PbEDTA 2 -. Ionic strength variation indicates that the reacting ions are not hydrolized to an appreciable amount at pH = 11.5. It is found that some of the products show light absorption in the region between 300 and 400 nm.
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