Isotope effect, magnetic

Turro, N.J., Chow, M.-F., Rigaudyo, J., 1981. Mechanism of thermolysis of endoperoxides of aromatic compounds. Activation parameters, magnetic field, and magnetic isotope effects. J Am Chem Soc. 103, 7218-7222. 

Macrocycles and other concave structures, acid-base behaviour in, 30,63 Macromolecular systems in biochemical interest, 13C NMR spectroscopy in, 13,279 Magnetic field and magnetic isotope effects on the products of organic reactions, 20,1 Mass spectrometry, mechanisms and structure in a comparison with other chemical processes, 8, 152... 

Products of organic reactions, magnetic field and magnetic isotope effects on, 30, 1 Protic and dipolar aprotic solvents, rates of bimolecular substitution reactions in, 5, 173 Protolytic processes in H20-D20 mixtures, 7, 259... 

Products of organic reactions, magnetic field and magnetic isotope effects on, 30, 1... 

The energetics of free radicals1,2 and estimation of their heats of formation by kinetic methods have been reviewed,3 along with the mechanism of magnetic isotope effects in radical reactions.4 Three-electron-bonded radicals (or a radicals) are the subject of a review which details methods of preparation and detection as well as examples of homo- and hetero-nuclear a radicals.5... 

Salikhov, K.M. (1996) Magnetic Isotope Effect in Radical Reactions An Introduction. Springer-Ver-lag, New York. 

Magnetic Field and Magnetic Isotope Effects on the Products of Organic Reactions... 

Nevertheless, all abnormal isotopic ratios are not necessarily related to an initial heterogeneity of the protosolar nebula. Magnetic isotope effects could have played a role during the accretion and even later, during the long life-time of the chondrites parent bodies. 

In this review article, we have emphasised the importance of 8 values as a means of probing synthetical pathways. Isotope effects are of prime importance in many fields including obviously geochemistry, cosmochemistry and astrophysics. In recent years, the general knowledge of isotope effects has increased significantly with the demonstration of the amount of non-mass-isotope effects and, more particularly, the magnetic isotope effect. 

The photolyses of 1,2-dipheny1-2-methyl-1-propa-none and its 2h and derivatives in micellar solution are now described and further demonstrate the enhanced cage and magnetic isotope effects of mlcelllzatlon. We report also the observation of CIDP during the photolyses of micellar solutions of several ketones, and demonstrate the validity of the radical pair model to these systems. Analyses of the CIDNP spectra in the presence and absence of aqueous free radical scavengers (e.g., Cu2+) allow us to differentiate between radical pairs which react exclusively within the micelle and those that are formed after diffusion into the bulk aqueous phase. In some cases this allows us to estimate a lifetime associated with the exit of free radicals from the micelles. 

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