engleski

Exploring the Scope of Macrocyclic "Shoe-last" Templates in the Mechanochemical Synthesis of RHO Topology Zeolitic Imidazolate Frameworks (ZIFs)

The macrocyclic cavitand MeMeCH2 is used as a template for the mechanochemical synthesis of 0.2MeMeCH(2)@RHO-Zn-16(Cl(2)Im) (32) (0.2MeMeCH(2)@ZIF-71) and RHO-ZnBIm(2) (ZIF-11) zeolitic imidazolate frameworks (ZIFs). It is shown that MeMeCH2 significantly accelerates the mechanochemical synthesis, providing high porosity products (BET surface areas of 1140 m(2)/g and 869 m(2)/g, respectively). Templation of RHO-topology ZIF frameworks constructed of linkers larger than benzimidazole (HBIm) was unsuccessful. It is also shown that cavitands other than MeMeCH2- namely MeHCH2, MeiBuCH(2), HPhCH2, MePhCH2, BrPhCH2, BrC5CH(2)-can serve as effective templates for the synthesis of x(cavitand)@RHO-ZnIm(2) products. The limitations on cavitand size and shape are explored in terms of their effectiveness as templates.

mechanochemical synthesis ; zeolitic imidazolate frameworks ; templation ; microporous materials

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