Issue 16, 2003

Controlling chemistry with cations: photochemistry within zeolites

Abstract

The alkali ions present in the supercages of zeolites X and Y interact with included guest molecules through quadrupolar (cation-π), and dipolar (cationcarbonyl) interactions. The presence of such interactions can be inferred through solid-state NMR spectra of the guest molecules. Alkali ions, as illustrated in this article, can be exploited to control the photochemical and photophysical behaviors of the guest molecules. For example, molecules that rarely phosphoresce can be induced to do so within heavy cation-exchanged zeolites. The nature (electronic configuration) of the lowest triplet state of carbonyl compounds can be altered with the help of light alkali metal ions. This state switch (nπ*–ππ*) helps to bring out reactivity that normally remains dormant. Selectivity obtained during the singlet oxygen oxidation of olefins within zeolites illustrates the remarkable control that can be exerted on photoreactions with the help of a confined medium that also has active sites. The reaction cavities of zeolites, like enzymes, are not only well-defined and confined, but also have active sites that closely guide the reactant molecule from start to finish. The examples provided here illustrate that zeolites are far more useful than simple shape-selective catalysts.

Graphical abstract: Controlling chemistry with cations: photochemistry within zeolites

Article information

Article type
Feature Article
Submitted
02 ጃንዩ 2003
Accepted
26 ማርች 2003
First published
09 ጁላይ 2003

Chem. Commun., 2003, 1987-1999

Controlling chemistry with cations: photochemistry within zeolites

V. Ramamurthy, J. Shailaja, L. S. Kaanumalle, R. B. Sunoj and J. Chandrasekhar, Chem. Commun., 2003, 1987 DOI: 10.1039/B212741E

To request permission to reproduce material from this article, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

Read more about how to correctly acknowledge RSC content.

Social activity

Spotlight

Advertisements