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Chapter 2 13<br />
concentrated sodium hydroxide at 100°C for 24 hours does not alter the framework.<br />
Another well-known example exhibiting high chemical stability is MOFs based on the<br />
Zr(IV) cuboctahedral SBUs. In fact, high acid (HCl, pH = 1) and base resistance (NaOH, pH<br />
= 14) of UiO-66 (Zr6O4(OH)4(bdc)6) and its NO2 - and Br - functionalized derivatives was<br />
observed. [54-55] Furthermore, a structure of pyrazolate-bridged MOF (Ni3(BTP)2; BTP3 - =<br />
4,4’,4’’-(benzene-1,3,5-triyl)tris(pyrazol-1-ide)) was fully preserved after treatment in<br />
aqueous solutions within a wide pH value range (from 2 to 14) at 100 °C for 2 weeks. [56]<br />
Thus, such MOFs featuring high chemical stability are promising to afford benefit of<br />
enhancing their performance in carbon dioxide capture from humid flue gas, pave the way<br />
of their applications to water-containing processes, etc.<br />
To summarize, characteristic features of MOFs include (i) well-ordered porous structures<br />
and designable channel surface functionalities, (ii) flexible, dynamic behavior in response<br />
to guest molecules, and (iii) good thermal stability and (in some cases) also chemical<br />
stability. It can be expected that the diverse chemistry of MOFs (i.e. huge variety of<br />
inorganic SBUs and organic linkers bearing distinct functionalities) can result in a wide<br />
range of different framework structures as well as in deliberate tuning of their properties,<br />
which eventually leads to their applications in various fields.
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