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The gas-phase homolytic C-H and N-H bond dissociation energies(BDE)of the substi-tuted phenoacetonitrile families,aromatic amines,and semicarbazone derivatives were systematically investigatedor reinvestigated based on a cycle utilizing the thermodynamic quantities determined in DMSO solution.Theexperimental evidence collected in.this work dearly indicates that the radicals derived from the above familiesare of the‘Class O’type,i.e.to be stabilized by a remote electron-donating substituent but destabilized by anelectron-withdrawing substituent.
The gas-phase homolytic CH and NH bond dissociation energies (BDE) of the substi-tuted phenoacetonitrile families, aromatic amines, and semicarbazone derivatives were systematically investigated in based on a cycle utilizing the thermodynamic indices determined in DMSO solution. Experimental evidence collected in. this work dearly indicates that the radicals derived from the above familiesare of the’Class O’type, ieto be stabilized by a remote electron-donating substituent but destabilized by anelectron-withdrawing substituent.