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Protecting group chemistry was used to functionalize the channel entrances of zeolite L crystals. This approach is broadly applicable and can be used to obtain a wide range of new zeolite-based materials. The picture shows two microcrystals modified with amino groups at the channel entrances, which reacted further with a red-luminescent head molecule. FG=functionalizing group, prot.=protector.
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Huber et al. (2004) studied this question.
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