All-or-Nothing Cooperative Self-Assembly of an Annulene Sandwich


  • We thank the European Commission for funding through THREADMILL (MRTN-CT-2006-036040) and Prof. R. J. Nicholas for providing access to NIR photoluminescence instrumentation.


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Ring-fenced: A 14-component assembly is formed by coordinating 1,4-diazabicyclo[2.2.2]octane (DABCO) to a [12]porphyrin nanoring. The 24 zinc–nitrogen interactions in this sandwich complex lock each conjugated macrocycle into a planar conformation, dramatically sharpening the near-IR absorption band. This result highlights the scope of double-strand formation as a way of creating nano-objects with well-defined shapes.