Permeable, Microporous Polymeric Membrane Materials Constructed from Discrete Molecular Squares


  • We thank Prof. John Lindsey for helpful discussions, Prof. Felix Castellano for a sample of Ru(PNI-phen)2+3, and Prof. Cynthia Larive for PFG-NMR measurements. We thank the U.S. Dept. of Energy, Office of Science, and initially the Northwestern Institute for Environmental Catalysis for financial support. Melinda H. Keefe and Jodi L. O'Donnell have contributed equally to this work.


Microporous polyester membranes (see Figure) have been formed via interfacial polymerization. The reactants were porphyrin-based square assemblies functionalized with phenol groups and bis(acid chloride) linkers. The membranes are free-standing and display size-selective porosity, allowing transport of molecules smaller than the intra-square cavity and displaying blocking behavior with respect to larger molecules.