Exploring the Scope of Macrocyclic “Shoe-last” Templates in the Mechanochemical Synthesis of RHO Topology Zeolitic Imidazolate Frameworks (ZIFs)
oleh: Ivana Brekalo, David E. Deliz, Christopher M. Kane, Tomislav Friščić, K. Travis Holman
| Format: | Article |
|---|---|
| Diterbitkan: | MDPI AG 2020-02-01 |
Deskripsi
The macrocyclic cavitand <b>MeMeCH</b><sub>2</sub> is used as a template for the mechanochemical synthesis of 0.2<b>MeMeCH</b><sub>2</sub>@RHO-Zn<sub>16</sub>(<b>Cl</b><sub>2</sub><b>Im</b>)<sub>32</sub> (0.2<b>MeMeCH</b><sub>2</sub>@ZIF-71) and RHO-Zn<b>BIm</b><sub>2</sub> (ZIF-11) zeolitic imidazolate frameworks (ZIFs). It is shown that <b>MeMeCH</b><sub>2</sub> significantly accelerates the mechanochemical synthesis, providing high porosity products (BET surface areas of 1140 m<sup>2</sup>/g and 869 m<sup>2</sup>/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 <b>MeMeCH</b><sub>2</sub>—namely <b>MeHCH</b><sub>2</sub>, <b>Me</b><b><i>i</i></b><b>BuCH</b><sub>2</sub>, <b>HPhCH</b><sub>2</sub>, <b>MePhCH</b><sub>2</sub>, <b>BrPhCH</b><sub>2</sub>, <b>BrC5CH</b><sub>2</sub>—can serve as effective templates for the synthesis of <i>x</i>(cavitand)@RHO-ZnIm<sub>2</sub> products. The limitations on cavitand size and shape are explored in terms of their effectiveness as templates.