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Electronic states of cis- and trans-decalin radical cations in zeolites

✍ Scribed by Mary V. Barnabas; Alexander D. Trifunac

Publisher
Elsevier Science
Year
1991
Tongue
English
Weight
494 KB
Volume
187
Category
Article
ISSN
0009-2614

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✦ Synopsis

The radical cations ofcis-and transdecalin have been studied in different synthetic zeolite matrices by EPR spectroscopy. The radical cations were produced by y-radiolysis at 77 K. The tirst experimental observation of both the electronic states (2Al : a(4H)=50 G and *A$ a(4H)=29 G) of the cis-decalin radical cation is reported. The 'A, and *A2 states were observed at different temperatures in silicalite S-l IS. In ZSM-34 and Na-ll-5 one species was observed preferentially, while in offretite a fast exchange between the two states was observed. In Na-Y and Na-X the 2A2 state was the principal species observed. In addition, the bridge-head neutral radical species resulting from ion-molecule reactions was observed. For trans-decalin+', the *A, was observed in ZSM-34, and the *B, state was observed in Na-R-5. In silicalite, only the *A, state was observed at low temperature. The results for cis-and trans-decalin+' in offretite, Na-Y and Na-X were similar. The stabilization of radical cations via matrix interactions is discussed.

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