Zeolite inclusion chemistry, encapsulation

As a last example of zeolite inclusion chemistry, we discuss the assembly of polyacrylonitrile (PAN) strands in different large-pore zeolites, zeolite Y and mordenite, and explore the pyrolysis reactions of the encapsulated polymer (Figure 6).88... 

Zeolite molecular sieves are very attractive candidates for inclusion chemistry in structurally well-defined, nanometer-size chaimel structures. The present review focuses on recent studies addressing the encapsulation of molecular conductors in zeolite host channels. 

Numerous studies have established the wide scope of inclusion chemistry that is possible with inorganic solids. From layered hosts such as FeOCl and nanoporous membranes to zeolite molecular sieves, very different dimensions are accessible for the encapsulation of conjugated, potentially conducting materials. Zeolites are distinct hosts because they offer well-defined, crystalline pore systems at molecular dimensions, with sizes in mesoporous systems now reaching even beyond the molecular scale. 

Balkus KJ Jr, Gabrielov AG (1995) Zeolite encapsulated metal complexes. In Herron N, Corbin DR (eds) Inclusion chemistry with zeolites nanoscale materials by design. Kluwer, Dordrecht, p 159... 

The crystalline microporosity and well-defined internal surfaces of zeolites, in addition to their great chemical variety, make these materials very attractive hosts for many areas of inclusion chemistry. o A brief overview of encapsulation strategies follows. 

Encapsulation chemistry similar to that described above (exchange of anilinium, followed by oxidation with peroxydisulfate) was foimd to produce polyaniline not only in zeolite Y, but also in montmorillonite clay. 5 Spectral features (UV-VIS, IR and EPR) of the products were indicative of emeraldine salt and base formation, respectively. The change in basal spacing of the montmorillonite upon intercalation provided additional evidence for the inclusion polymerization. 

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