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A new synthetic method to cycloparaphenylenes, which are the simplest structural unit of armchair carbon nanotubes, has been developed. The method allows the synthesis of several cycloparaphenylenes including 8 cycloparaphenylene (fig1), which is the smallest cycloparaphenylene derivative synthesized to date, by way of square shaped tetranuclear biaryl-platinum complexes. Cycloparaphenylenes shows different fluorescence depending on the ring size (fig2) and provides new fundamental skeletons of organic electro-luminescent materials.



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