Dissociation energy, of chemical bonds

Gurvich, L. V., Karachievtziev, G. V., Kondratiev, V. N., Lebedev, Yu. A., Medvedev, V. A., Potapov, V. K., Hodiev, Yu. S. Dissociation energies of chemical bonds. Ionization potentials and electron affinities. Moscow Nauka 1974... 

For the simple radicals these data are known from studies of flame reactions. Furthermore the dissociation energies of chemical bonds have been determined by thermochemical measurements. Table 20.3 provides the full information on these bond dissociation energies. 

Figure 2. Bond dissociation energies of chemical bonds in paper constituents in relation to light energy quanta...

V. N. Kondratev, (ed.). Dissociation Energy of Chemical Bonds. Ionization Potentials and Electron Affinities, Nauka, Moscow, 1974 (in Russian). 

Whether a ketone can undergo a-cleavage depends on a complex function of the dissociation energy of the bond being broken and the excitation energy of the excited state, and competition with other physical and chemical decay processes available to the excited states. Suitably designed ketones which eschew Norrish I reactions in favor of the Norrish II pathways are plentiful and their photochemical behavior has been studied in depth. 

The low values of dissociation energy of a bond metal-carbon are characteristic particularly for alkyl transition-metal compounds. Some of them are the key intermediates of Ziegler-Natta low-pressure polymerization of alkenes. Outside the laboratory or chemical plant [43, 44], Nature gives us also important representatives of such compounds namely vitamin B12 or coenzyme B12. 

The formation of a macro-radical depends on the chemical structure of the polymer, or more precisely on the dissociation energies of particular bonds between the atoms forming the polymer. In the polyisoprene macromolecule the dissociation energies of various bonds are given in Table 1 [437]. When a sufficiently high energy, greater than the... 

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