390364-17-7Relevant academic research and scientific papers
Preparation, spectral behaviour and oxidation of some new zinc(II) salicylaldimines containing sterically hindered phenol
Kasumov, Veli T.
, p. 2337 - 2344 (2001)
A series of new bis[N-(2,6-di-tert-butyl-1-hyxyphenyl)salicylideneminato]zinc(II) complexes bearing one or two HO- and CH3O-substituents on the salicylaldehyde moiety were prepared, and their spectroscopic properties (IR, electronic, 1H NMR) as well as the ESR spectra of the one-electron oxidation products were examined. The 1H NMR examination of Zn(Lx)2 indicates that, contrary to expectations, the proton resonances of the complexes are shifted to the high-field side compared with those of the free ligands. Oxidation of these compounds with PbO2 results in the formation of mono- and biradical types Zn(II)-stabilized phenoxyls in which there are both anisotropic and alternating line-width trends. Some spectral patterns are typical for weak interacting (J?A) or the case of J～A biradicals, in which ESR signal appeared as superimposition of two non-interacting monoradical centers with S = 1/2. ESR studies on biradicals type of Zn(L·x)2 at 300 and 77 K did not show any evidence of strong exchange coupling in these systems. All radical species were characterized by the ESR parameters.
