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.
ASJC Scopus subject areas
- Renewable Energy, Sustainability and the Environment
- Materials Science(all)