Synthesis and ESR investigation of new coordination compounds with a phenoxyl free radical ligand based on N-(3,5-DI-tert-butyl-2-hydroxyphenyl)salicylaldimine
A method is proposed for the preparation of 2-amino-4,6-di-tert-butylphenol. N-(3,5-Di-tert-butyl-2-hydroxyphenyl)salicylaldimine is readily mercurated with the formation of a mercury-containing free radical. Pd(II), Co(II), and VO(II) salicylaldiminates based on 2-amino-4,6-di-tert-butylphenol are capable of one-electron oxidation with the formation of metal-containing phenoxyl radicals. Analysis of the ESR spectra showed that the appearance of the metallocycle leads to a sharp increase in the stability of the radical system.