Evaluation of Brønsted acidity and proton topology in Zr- and Hf-based metal-organic frameworks using potentiometric acid-base titration

Rachel C. Klet, Yangyang Liu, Timothy C. Wang, Joseph T Hupp, Omar K. Farha

Research output: Contribution to journalArticle

106 Citations (Scopus)


Potentiometric acid-base titration is introduced as a method to evaluate pKa values (Brønsted acidity) of protons present in the nodes of water stable Zr6- and Hf6-based metal-organic frameworks (MOFs), including UiO-type MOFs, NU-1000, and MOF-808. pKa values were determined for the three typical types of protons present in these MOFs: μ3-OH, M-OH2, and M-OH (M = Zr, Hf). Additionally, the data was used to quantify defect sites resulting from either a surfeit or shortage of linkers in the MOFs and to provide information about the true proton topology of each material.

Original languageEnglish
Pages (from-to)1479-1485
Number of pages7
JournalJournal of Materials Chemistry A
Issue number4
Publication statusPublished - Jan 4 2016


ASJC Scopus subject areas

  • Chemistry(all)
  • Renewable Energy, Sustainability and the Environment
  • Materials Science(all)

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