MONOMER-DIMER EQUILIBRIUM AND PHOTOCHEMICAL BEHAVIORS OF THE 1-METHYL-4-PHENYLPYRIDINYL RADICAL

A neutral free radical, 1-methyl-4-phenylpyridinyl radical, can be isolated by distillation under a vacuum. Equilibrium between the radical and the diamagnetic radical dimer, photochemical dissociation of the dimer with visible light, and photochemical decomposition of the radical with ultraviolet light to generate the phenyl radical have been demonstrated.