title: Enhanced catalytic activity on titanosilicate molecular sieves controlled by cation-π interactions.
abstract: A new class of heterogeneous catalytic systems utilizing cation-guest interactions was designed based on microporous titanosilicate molecular sieves. Introducing heavier alkali metal cations on ion-exchange sites of the framework resulted in a significant enhancement of the catalytic activity for oxidation of cyclohexene and styrene, whereas such an enhancement was not observed in oxidation of cyclohexane without π systems. Distinct relationships between the catalytic activities and intermolecular interaction energies which were determined by IR spectroscopic and computational approaches clearly evidenced the predominance of the cation-π interaction in this catalytic system.
authors.affiliation: Division of Materials and Manufacturing Science, Graduate School of Engineering, Osaka University, 2-1 Yamada-oka, Suita, Osaka, Japan.
authors.forename: Yasutaka
authors.initials: Y
authors.lastname: Kuwahara
authors.forename: Kazuto
authors.initials: K
authors.lastname: Nishizawa
authors.forename: Takahito
authors.initials: T
authors.lastname: Nakajima
authors.forename: Takashi
authors.initials: T
authors.lastname: Kamegawa
authors.forename: Kohsuke
authors.initials: K
authors.lastname: Mori
authors.forename: Hiromi
authors.initials: H
authors.lastname: Yamashita