Low-temperature study of radical cations of quadricyclane and norbornadiene in Na-ZSM-5 zeolites

Autor:	D.W. Werst, K.R. Cromack, Alexander D. Trifunac, Mary V. Barnabas
Rok vydání:	1994
Předmět:	Radical Norbornadiene Matrix isolation General Physics and Astronomy Photochemistry law.invention chemistry.chemical_compound chemistry Radical ion law Physical and Theoretical Chemistry ZSM-5 Quadricyclane Zeolite Electron paramagnetic resonance
Zdroj:	Chemical Physics Letters. 218:485-491
ISSN:	0009-2614
DOI:	10.1016/0009-2614(94)00026-3
Popis:	We have observed quadricyclane and norbornadiene radical cations in different pentasil type zeolites by EPR spectroscopy after 4 K in situ electron beam irradiation of samples in the EPR spectrometer. We report the first evidence for matrix isolation of the quadricyclane radical cation. It is stable in polar Na-ZSM-5 zeolites below 20–30 K. Formation of the bicyclo [3.2.0]-hepta-2, 6-diene radical cation is observed in both quadricyclane- and norbornadiene-loaded zeolites. The onset temperature for the formation of the bicyclo [3.2.0] hepta-2, 6-diene radical cation depends on the substrate concentration and zeolite polarity and was as low as 30 K in polar zeolites when the substrate concentration was high.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::790bf71a2babd97493ed1879dd91f0cb https://doi.org/10.1016/0009-2614(94)00026-3 Zobrazit plný text záznamu