Nitroxide radical pairs in the plastic crystal camphene
作者： S. H. Glarum , J. H. Marshall
DOI: 10.1063/1.430511
关键词: Photochemistry 、 Vacancy defect 、 Nitroxide mediated radical polymerization 、 Plastic crystal 、 Melting point 、 Electron paramagnetic resonance 、 Molecular physics 、 Radical 、 Lattice (order) 、 Adiabatic process 、 Chemistry
摘要: Electron spin resonance is employed to study pairs of nitroxide radicals in the plastic phase dl−camphene. Both Δm = 1 and 2 transitions are observed, an adiabatic theory presented for dependence absorption intensity, second−order shift, linewidth latter upon radical pair distributions motions. Results interpreted by a model which nearly randomly distributed over lattice sites, vacancies thermally generated, diffusion occurs vacancy mechanism. The enthalpies formation are, respectively, 4.6 11 kcal/mole, while at melting point D ? 10−7 cm2/sec.
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