The electronic configuration and oxygenation of NN′-ethylenebis(salicylaldehydeiminato)cobalt(II) studied by electron spin resonance spectroscopy

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Abstract
An e.s.r. study of [Co(salen)] in different solvents revealed that the electronic configuration (dyz)2(dzx)2(dxy)2(dz2)1(dx2–y2)0 is required for the compound to be able to oxygenate, while another configuration (dyz)2(dzx)2-(dz2)2(dx2–y2)0 which is realized in certain solvents does not permit oxygenation of the compound at room temperature.