The ESR method was used to study the interaction of furan and thiophene compounds with Cu(II) ions in ZSM-5 zeolite.
In the dehydrated Cu-ZSM-5, Cu(II) ions seemed to be located at two magnetically different sites and migrated to another site to form the charge transfer complex with thiophene and furan compounds.
3-Methylthiophene and 2,5-dimethylthiophene produced stable radical cations while thiophene and 2-methylthiophene reacted further with other radical cations.
High silica to alumina ratio and channel structure of ZSM-5 zeolite seemed to affect the ESR spectrum arising from the interaction of furan and thiophene compounds with Cu(II) ions in Cu-ZSM-5 zeolite.
