Effect of Elevated Air Humidity on the Structure and Proton Conductivity of Porphyrin-Based Zr(IV)-MOFs
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61389013%3A_____%2F25%3A00637946" target="_blank" >RIV/61389013:_____/25:00637946 - isvavai.cz</a>
Alternative codes found
RIV/61388980:_____/25:00637946 RIV/00216275:25310/25:39923298 RIV/00216208:11320/25:10511231
Result on the web
<a href="https://hdl.handle.net/11104/0368741" target="_blank" >https://hdl.handle.net/11104/0368741</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1021/acs.inorgchem.5c02165" target="_blank" >10.1021/acs.inorgchem.5c02165</a>
Alternative languages
Result language
angličtina
Original language name
Effect of Elevated Air Humidity on the Structure and Proton Conductivity of Porphyrin-Based Zr(IV)-MOFs
Original language description
Metal-organic frameworks (MOFs) based on Zr6(mu 3-O)8 oxometallic clusters are attracting attention as potential proton conductors due to their high surface area, ease of further substitution, and exceptional chemical stability. We hereby present an examination of two Zr(IV)-MOFs with a tetrakis(4-carboxyphenyl)porphyrin (TCPP4-) linker, PCN-222 and PCN-224, as proton conductors. It was found that, in spite of their excellent stability in aqueous suspensions, in the environment of elevated air humidity, serious changes in their bonding system occur, mainly involving breakage of the carboxylate coordination bonds and hydration of the Zr6(mu 3-O)8 clusters, which leads to gradual amorphization and loss of porous character. The stability of the structures can be improved by postsynthetic modification with diphenylphosphinic acid (DPPA) to some extent. Inclusion of host imidazole molecules facilitates proton mobility in the pore system of the MOFs, further accelerating the structural degradation. Even though the original structures of the MOFs collapse under the conditions of proton conductivity measurement, the resulting amorphous solids still reveal a proton conductivity up to 6.7 x 10-6 S<middle dot>cm-1 at ambient temperature and a 92% relative humidity, which is comparable to that of other Zr(IV)-MOFs with well-preserved structures. The presented study demonstrates an important phenomenon that has to be considered with any investigation using MOFs as proton conductors.
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10404 - Polymer science
Result continuities
Project
Result was created during the realization of more than one project. More information in the Projects tab.
Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace
Others
Publication year
2025
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Inorganic Chemistry
ISSN
0020-1669
e-ISSN
1520-510X
Volume of the periodical
64
Issue of the periodical within the volume
31
Country of publishing house
US - UNITED STATES
Number of pages
12
Pages from-to
15993-16004
UT code for WoS article
001539119000001
EID of the result in the Scopus database
2-s2.0-105013405773