Cages of cubic faujasite FAU and its hexagonal polymorph EMT can house Co2+ complexes of the pentadentate Schiff base smdpt (structure from computer simulations shown on the right). The influence of the framework topology on complexation was examined. In addition, these enclosed complexes can bind dioxygen reversibly as proved by ESR studies. H2smdpt = bis[3-(salicylidenamino)propyl]methylamine.
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Vos et al. (1994) studied this question.
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