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Inne
Hyperfine parameters of pyridyl-containing iminoxy radicals generated from oximes by γ-irradiation and in zeolite lattice: EPR spectroscopy and density functional study.
Autorzy
Rok wydania
1999
Czasopismo
Spectrochimica Acta Part A-Molecular and Biomolecular Spectroscopy
Numer woluminu
55A
Strony
1699-1709
DOI
10.1016/S1386-1425(99)00026-8
Kolekcja
Język
Angielski
Typ publikacji
Artykuł
Incorporation of pyridyl oximes into the channels of thermally activated pentasil zeolite ZSM-5 gives rise to iminoxy radicals. EPR spectrum of the species derived by dehydrogenation of di-2-pyridilketone oxime is fully anisotropic and characteristic for the iminoxy σ-type neutral radical. The EPR spectra of the radicals derived from 2-pyridinealdoxime and 4-pyridinealdoxime exhibit additional splitting due to the azomethine hydrogen. The ĝ and  tensor parameters were determined on the basis of EPR spectra. In order to identify a geometric isomer (E or Z) of the iminoxyls obtained in the pores of the zeolite and within γ-irradiated samples of solid oximes, hyperfine interaction parameters of the generated radicals were compared with the parameters calculated using density functional theory (DFT); these calculations allow to characterize the iminoxy radical isomers formed in zeolite and oxime matrices.
Adres publiczny
https://doi.org/10.1016/S1386-1425(99)00026-8