Directed Assembly of Nanoporous, Porphyrin-Based, Molecular-Square Thin Films

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Several phosphonate-functionalized molecular squares have been successfully synthesized, and the fabrication of multilayer films on both conductive and semiconducting platforms has been demonstrated. These films were grown using the well-documented zirconium phosphonate multilayer method. The layer-by-layer growth rate is uniform. Experiments suggest, however, that the molecular squares adopt a semi-collapsed structure upon assembling in multilayer films. Despite this structure, the films are still impermeable to molecules larger than the dimensions of an individual square cavity but highly permeable to smaller species. This research also has successfully observed a single iteration of the zirconium phosphonate multilayer assembly of the molecular square by scanning electron microscopy and atomic force microscopy through micromolding in capillary micropatterning techniques. It has demonstrated the applicability of ZPM synthesis to direct and orient larger molecular assemblies, such as nanoarchitectures, into thin-film assemblies using molecular structures with cross-sectional areas larger than have been previously reported. Furthermore, the squares were characterized by X-ray reflectivity

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  • 07/12/2018
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