Over the past decade, the promise of functional materials with applications in catalysis, separations, storage, and energy transfer has turned molecular-level synthesis and design of materials into one of the most exciting frontiers in modem chemistry. In particular, macroscopic materials created from small molecules often show unique and/or enhanced properties beyond those of their molecular components. Among the known moleculat building blocks, porphyrins constitute a highly attractive class of "synthons" for functional nanomaterials due to their unique photonic and electronic properties, which can be rationally modified by synthetic manipulations. However, examples of well-defined, molecularly assembled porphyrinic materials that can be systematically built up from the nano- to microscale in a hierarchical and controlled fashion are rare.
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