Host-guest interactions: ferrocene in KY zeolite

Abstract Host–guest interactions of ferrocene in KY zeolite were investigated using muon spin relaxation (μSR). Temperature-dependent measurements enable us the determination of the activation parameters for the low energy dynamic processes of the encapsulated ferrocene. A comparison between the μSR results and the earlier neutron measurements illustrates the advantage of the former technique for probing the lowest unoccupied molecular orbital (LUMO).