Journal
BULLETIN OF THE KOREAN CHEMICAL SOCIETY
Volume 43, Issue 7, Pages 912-917Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/bkcs.12539
Keywords
coordination polymer; functionalization; metal-organic framework; proton conductivity; tetrazole
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Funding
- Korea Foundation for the Advancement of Science and Creativity (KOFAC) - Ministry of Education (Republic of Korea) [2021]
- National Research Foundation of Korea (NRF) - Ministry of Education [2019H1A2A1076014]
- National Research Foundation of Korea [2019H1A2A1076014] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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In this study, Zr-based metal-organic frameworks (MOFs) modified with uncoordinated tetrazole ligands were investigated for their proton conductivity. The results showed that the uncoordinated tetrazole-containing MOFs exhibited lower activation energy, indicating the involvement of Grotthuss proton conduction mechanism.
Zr-based metal-organic frameworks (MOFs) were modified with pendant tetrazole ligands for proton conductivity studies. Although tetrazolate ligands coordinated to metal cations have been widely utilized to construct MOFs or porous coordination polymers, to date, the use of uncoordinated tetrazole groups in MOFs has been limited. In this study, a benzene-1,4-dicarboxylic acid with pendant tetrazole groups (BDC-N-4) was synthesized and used to prepare a Zr-based UiO-66 MOF using a mixed-ligand strategy. The tetrazole-functionalized UiO-66-N-4 was compared to MOFs containing other acidic functional groups (hydroxyl, carboxylic acid, and sulfonic acid) with respect to their proton conductivities and acidities (calculated pK(a)). Interestingly, UiO-66-N-4 showed a significant decrease in the activation energy with increase in the amount of added tetrazole groups, suggesting the Grotthuss proton conduction mechanism for uncoordinated tetrazole-containing MOFs.
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