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Radicals in the Zeolites NH

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EPR of O

2–

Radicals in the Zeolites NH

4

NaY and NH

4

CaA

F. K¨oksal and F. Ucun

a

Physics Department, Faculty of Arts and Sciences, Ondokuz Mayıs University, Samsun, Turkey

aDepartment of Physics, Faculty of Arts and Sciences, S¨uleyman Demirel University, Isparta, Turkey

Z. Naturforsch. 53 a, 951–954 (1998); received October 28, 1998

Activated and non-activated states of the zeolites NH4NaY and NH4CaA, and their NH+4forms were prepared with an (NH4)2SO4solution and were investigated by EPR after -irradiation.

The formed radicals were attributed to O2 supposed to be trapped near a trigonally coordinated framework of 27Al (I = 5/2). Anisotropic O2 spectra were observed, consisting of hyperfine structure due to the27Al framework, even at room temperature. This was attributed to the scarceness of NH+4 sites or trap sites because of the preparation of the NH+4forms of the zeolites with an (NH4)2SO4solution. The crystal field splittings were found and interpreted.

Key words: EPR; Zeolites; O2; NH4NaY; NH4CaA.

Reprint requests to Prof. Dr. F. Köksal; Fax: +90 3624 576081.

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