Low-temperature study of radical cations of quadricyclane and norbornadiene in Na-ZSM-5 zeolites.
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.
- Research Organization:
- Argonne National Laboratory (ANL)
- Sponsoring Organization:
- ER
- DOE Contract Number:
- AC02-06CH11357
- OSTI ID:
- 937698
- Report Number(s):
- ANL/CHM/JA-12253
- Journal Information:
- Chem. Phys. Lett., Journal Name: Chem. Phys. Lett. Journal Issue: 1994 Vol. 218
- Country of Publication:
- United States
- Language:
- ENGLISH
Similar Records
Studies of radiation-produced radicals and radical ions. Progress report, September 1, 1990--October 15, 1991
Studies of radiation-produced radicals and radical ions