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Title: Effect of Keggin polyoxometalate on Cu(II) speciation and its role in the assembly of Cu-3(BTC)(2) metal-organic framework
Authors: Bajpe, Sneha ×
Breynaert, Eric
Mustafa, Danilo
Jobbagy, Mati
Maes, André
Martens, Johan
Kirschhock, Christine #
Issue Date: 2011
Publisher: Royal Society of Chemistry
Series Title: Journal of Materials Chemistry vol:21 issue:26 pages:9768-9771
Abstract: HKUST-1 is one of the popular metal-organic frameworks (MOFs). The formation of this MOF is significantly accelerated by adding Keggin polyoxometalate anions to the synthesis solution. In this paper the chemistry behind this observation was investigated. Upon addition of Keggin type H3PW12O40 heteropolyacid the speciation of Cu2+ cations in ethanol : H2O mixture drastically changes. Combining EPR and XANES measurements with accurate pH measurements and prediction of Cu2+ hydrolysis provides strong evidence for surface induced hydrolysis and consequent dimerisation of monomeric Cu2+ species on Keggin ions in acidic conditions. This enables paddle wheel formation, hence explaining the instantaneous precipitation of Cu-3(BTC)(2) at room temperature and the systematic encapsulation of Keggin ions in its pores.
ISSN: 0959-9428
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Centre for Surface Chemistry and Catalysis
× corresponding author
# (joint) last author

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