A novel ESR method based on dilute solid solutions of Mn3+/Mn2+ ions in MgO for detecting spillover of hydrogen from noble metals

Abstract Dilute solutions of Mn 3+ ions in pure MgO are ESR silent, but on reduction by spiltover hydrogen from noble metals show strong ESR signals characteristic of Mn 2+ ions in this matrix. The same solids are also active for the dehydrodimerization of triphenylamine at room temperature as shown by the presence of both radical cations and Mn 2+ ions.