Dissociative halogenated organic compounds

The temperature dependence of the alkyl halides was one of the first subjects to be studied using the ECD. These are the simplest to analyze because often there is only one temperature region when dissociative thermal electron attachment is exothermic. This means that the EDEA, the energy of dissociative electron attachment, is positive EDEA = a(X) - D(R —X). The alkyl bromides, iodides, and chlorides are among the few organic compounds that have positive EDEA. Like the homono-nuclear diatomic halogen ions, the ground-state anionic curves for these molecules are M(3), with positive values for all three Herschbach metrics—EDEA, Ea, and VEa. 

SALT. A compound formed by replacement of part or all of the hydrogen of an acid by one (or more) element(s) or radrcal(s) that are essentially inorganic. Alkaloids, amines, pyridines, and other basic organic substances may be regarded as substituted ammonias in this connection. The characteristic properties of salts are the ionic lattice in the solid state and the ability to dissociate completely in solution. The halogen derivatives of hydrocarbon radicals and esters are not regarded as salts in the strict definition of the term,... 

In this chapter we have been concerned with the dissociation energies of M—R bonds in compounds of the type MR,. In the group of compounds investigated, M is either a transition metal, a representative metal (e.g. Li, Al) or a 6-Group metal (e,g. Zn, Ga). The group R is either an organic radical (e.g. methyl, cj clo-pentadienyl) or a halogen atom. 

In reactions with organic molecules e q reacts as nucleophilic reagent it attacks molecules with low-lying molecular orbital, like aromatic hydrocarbons, conjugated olefinic molecules, carboxyl compounds, and halogenated hydrocarbons (Swallow 1982 Buxton 1982, 1987 Buxton et al. 1988). In the latter case, addition is usually followed by halide ion elimination, so the reaction can be considered as a dissociative electron capture. For instance, the reaction with chlorobenzene yields phenyl radical and chloride ion... 

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