Microporous framework solids families

Inorganic molecular sieves in which all of the framework cations are coordinated octahedrally comprise a small but significant family of microporous solids. The octahedral molecular sieves, or OMS materials, related to manganese oxide minerals of the hollandite family, are the most important of these. Examples have been prepared by Suib and co-workers through the hydrothermal treatment of layered manganese oxides. Careful choice of additional metal ion content of such preparations controls the inorganic phase that forms. The... 

Other families of microporous solids, such as the aluminophosphates, are much more reactive in water, even in vapour form. Aluminium in these structures readily coordinates water to adopt five- or six-fold coordination, and exposure of many calcined AlPOs to moisture results in hydrolysis of framework bonds and loss of crystallinity. One way to avoid this, and thereby to enable handling, is to adsorb volatile organic compounds upon cooling after calcination. This protects the most reactive parts of the framework against... 

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