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Sorption measurements of water vapor on an isoreticular series of Imidazolate Frameworks
Potsdam (IFP), based on penta-coordinated metal centers with secondary building units (SBUs)
connected by multidentate amido-imidate-imidazolate linkers, have been carried out at 303.15 K. The
isotherm shapes were analyzed in order to gain insight into material properties and compared to
sorption experiments with nitrogen at 77.4 K and carbon dioxide at 273.15 K. Results show that water
vapor sorption measurements are strongly influenced by the pore size distribution while having a
distinct hysteresis loop between the adsorption and desorption branch in common. Thus, IFP-4 and
-8, which solely contain micropores, exhibit H4 (type I) isotherm shapes, while those of IFP-1, -2 and
-5, which also contain mesopores, are of H3 (type IV) shape with three inflection points. The choice
of the used linker substituents and transition metals employed in the framework has a tremendous
effect on the material properties and functionality. The water uptake capacities of the examined IFPs
are ranging 0.48 mmol g????1 (IFP-4) to 6.99 mmol g????1 (IFP-5) and comparable to those documented for
ZIFs. The water vapor stability of IFPs is high, with the exception of IFP-8.