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Proton Magnetic Resonance of Cu(II) Ammonia Complexes in Zeolite Y

The adsorption isotherms and proton NMR spectra of ammonia in copper exchanged zeolites, under various pretreatment conditions such as dehydration, oxidation and reduction with CO, were investigated. The zeolites containing Cu2+ species were found to exhibit two line spectra with one line being strongly shifted to high magnetic field. This component is due to paramagnetic Cu(II)complexes residing in the zeolite voids. From the values of the paramagnetic shifts and line widths which were studied as function of temperature in the range 230—410 K, the hyperfine coupling constant and the electron spin relaxation time of Cu2+ were obtained to be A/h = -2.7 MHz and ,, = 4