✍ Scribed by Mary V. Barnabas; Alexander D. Trifunac
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Radical cations were produced by y-irradiation of solutes in zeolites at 77 K. The radical cation of tetramethylethylene (TME) was examined by EPR in a variety of zeolites at different temperatures and loading. The TME monomer radical cation, the TME dimer radical cation and the neutral radical formed by proton transfer in the dimer cation were observed. The radial cation dimermonomer aggregation is reversible at low temperatures; above x I 10 K the neutral radical was observed. The effect of host zeolite interactions on the reactivity of tetramethylethylene radical cations in mazzite (Na-R-5 ) and
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Hexamethylethane (HME) and trimethylbutane (TMB) radical cations produced in ZSM-5 zeolite by y radiolysis undergo an elimination process followed by an ion-molecule reaction. The tetramethylethylene radical cation intermediate formed by CH, elimination from TMB+' is observed directly in the tempera
Neutral radicals are observed at 77 K following radiolysis of cycloheptatriene and cyclohexane adsorbed on ZSM-5 zeolites. The mechanism of radical formation is assigned to proton transfer from the sorbate radical cations to the zeolite lattice. In the case of cycloheptatriene, the ratio C,H;/C,H,+'
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-deca