Nanometer Rocks on Smooth Surfaces

Noncovalent assemblies of porphyrins have been realized with four zirconium (IV) phosphonate bonds as a cement between porphyrin planes. Tetraphosphonic acid porphyrins have been reported in the literature. An octaphosphonic ana- 

Wasielewski reported on similar porphyrin nanoparticles on mica, which were simply deposited by spin coating. These porphyrins carried four perylene substituents and were shown to be photoconductive.  

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