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Open Access Photochemical and Photophysical Studies within Zeolites

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In this article, we illustrate how one can utilize a zeolite matrix to control the photophysical and photochemical behavior of guest molecules included in them. In the first part, the emphasis is placed on the cation and on a single zeolite, faujasite (X and Y). Photophysical properties of naphthalene and other aromatic guest molecules included in X-type faujasite zeolites (M+X, M = Li, Na, K, Rb, Cs, Tl) have been investigated. As expected for an external heavy-atom-perturbed excited state, both singlet- and triplet-excited-state lifetimes and emission efficiencies depend upon the identity and accessibility of the cation present within the zeolite supercage. The power of the heavy-atom-cation effect in zeolites has been demonstrated by recording phosphorescence from several olefins whose phosphorescence has not previously been recorded. The second section brings out an inherent feature of a field at its infancy-serendipity. Surprisingly, radical ions of organic molecules can be generated and stabilized within zeolites by a simple procedure. This study has been expanded to include oligomers of thiophenes and α, ω-diphenylpolyenes which serve as models for conducting polymers. This is followed by a presentation wherein the importance of the relative size of the host cavity to that of the guest to achieve maximum selectivity in a photoreaction is highlighted. Concepts developed in this section with faujasite and pentasil (ZSM-5 and ZSM-11) as models are believed to be general and applicable to other organized media.

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Document Type: Research Article

Publication date: September 1, 1992

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  • International Journal for Chemistry and Official Membership Journal of the Swiss Chemical Society (SCS) and its Divisions

    CHIMIA, a scientific journal for chemistry in the broadest sense, is published 10 times a year and covers the interests of a wide and diverse readership. Contributions from all fields of chemistry and related areas are considered for publication in the form of Review Articles and Notes. A characteristic feature of CHIMIA are the thematic issues, each devoted to an area of great current significance.

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