Volume 43, Issue 7 pp. 912-917
Article

Uncoordinated tetrazole ligands in metal–organic frameworks for proton-conductivity studies

Daeyeon Lee

Daeyeon Lee

Department of Chemistry, Chungbuk National University, Cheongju, South Korea

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Sangho Lee

Sangho Lee

Department of Chemistry, Chungbuk National University, Cheongju, South Korea

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Younghu Son

Younghu Son

Department of Chemistry, Kyungpook National University, Daegu, South Korea

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Jun Yeong Kim

Jun Yeong Kim

Department of Chemistry, Chungbuk National University, Cheongju, South Korea

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Seungheon Cha

Seungheon Cha

Department of Chemistry, Chungbuk National University, Cheongju, South Korea

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Dongmin Kwak

Dongmin Kwak

Infectious Diseases Therapeutic Research Center, Korea Research Institute of Chemical Research, Daejeon, South Korea

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Jooyeon Lee

Corresponding Author

Jooyeon Lee

Department of Chemistry, Chungbuk National University, Cheongju, South Korea

Correspondence

Jooyeon Lee, Department of Chemistry, Chungbuk National University, Cheongju 28644, South Korea.

Email: [email protected]

Jaesung Kwak, Infectious Diseases Therapeutic Research Center, Korea Research Institute of Chemical Research, Daejeon 34114, South Korea.

Email: [email protected]

Minyoung Yoon, Department of Chemistry, Kyungpook National University, Daegu 41566, South Korea.

Email: [email protected]

Min Kim, Department of Chemistry, Chungbuk National University, Cheongju 28644, South Korea.

Email: [email protected]

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Jaesung Kwak

Corresponding Author

Jaesung Kwak

Infectious Diseases Therapeutic Research Center, Korea Research Institute of Chemical Research, Daejeon, South Korea

Correspondence

Jooyeon Lee, Department of Chemistry, Chungbuk National University, Cheongju 28644, South Korea.

Email: [email protected]

Jaesung Kwak, Infectious Diseases Therapeutic Research Center, Korea Research Institute of Chemical Research, Daejeon 34114, South Korea.

Email: [email protected]

Minyoung Yoon, Department of Chemistry, Kyungpook National University, Daegu 41566, South Korea.

Email: [email protected]

Min Kim, Department of Chemistry, Chungbuk National University, Cheongju 28644, South Korea.

Email: [email protected]

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Minyoung Yoon

Corresponding Author

Minyoung Yoon

Department of Chemistry, Kyungpook National University, Daegu, South Korea

Correspondence

Jooyeon Lee, Department of Chemistry, Chungbuk National University, Cheongju 28644, South Korea.

Email: [email protected]

Jaesung Kwak, Infectious Diseases Therapeutic Research Center, Korea Research Institute of Chemical Research, Daejeon 34114, South Korea.

Email: [email protected]

Minyoung Yoon, Department of Chemistry, Kyungpook National University, Daegu 41566, South Korea.

Email: [email protected]

Min Kim, Department of Chemistry, Chungbuk National University, Cheongju 28644, South Korea.

Email: [email protected]

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Min Kim

Corresponding Author

Min Kim

Department of Chemistry, Chungbuk National University, Cheongju, South Korea

Correspondence

Jooyeon Lee, Department of Chemistry, Chungbuk National University, Cheongju 28644, South Korea.

Email: [email protected]

Jaesung Kwak, Infectious Diseases Therapeutic Research Center, Korea Research Institute of Chemical Research, Daejeon 34114, South Korea.

Email: [email protected]

Minyoung Yoon, Department of Chemistry, Kyungpook National University, Daegu 41566, South Korea.

Email: [email protected]

Min Kim, Department of Chemistry, Chungbuk National University, Cheongju 28644, South Korea.

Email: [email protected]

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First published: 14 May 2022
Citations: 8

Daeyeon Lee, Sangho Lee, and Younghu Son contributed equally to this work.

Dedication on the occasion of Professor Sukbok Chang's 60th birthday.

Funding information: 2021 Undergraduate Research Program (URP); National Research Foundation of Korea (NRF) Global Ph.D. Fellowship Program, Grant/Award Number: 2019H1A2A1076014

Abstract

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-N4) was synthesized and used to prepare a Zr-based UiO-66 MOF using a mixed-ligand strategy. The tetrazole-functionalized UiO-66-N4 was compared to MOFs containing other acidic functional groups (hydroxyl, carboxylic acid, and sulfonic acid) with respect to their proton conductivities and acidities (calculated pKa). Interestingly, UiO-66-N4 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.

CONFLICT OF INTEREST

The authors declare no conflict of interest.

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