Abstract
The intermediate paramagnetic species formed in gamma-irradiated Ag NaA zeolites with adsorbed ammonia have been studied by ESR spectroscopy. For zeolites with silver loadings of about one Ag + ion per unit cell, the reaction of silver atoms with ammonia molecules above 180 K leads to the formation of paramagnetic silver—ammonia adducts Ag·NH 3 with the unpaired electron residing on both the silver and the nitrogen nuclei. For silver loadings of about six Ag + ions per unit cell, the formation of binuclear silver complexes with two magnetically non-equivalent Ag nuclei coordinated by NH 3 ligands is proposed based on line shape simulations of broad-line ESR septets.
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