Enhanced π Conjugation around a Porphyrin[6] Nanoring


  • This work was supported by EPSRC. We thank Johannes K. Sprafke for preliminary experiments on the synthesis of the template, and the EPSRC Mass Spectrometry Service (Swansea) for mass spectra.


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Strong cycle: The cyclic hexamer–template complex 3 obtained through template-directed trimerization of a porphyrin dimer 2, using a hexapyridyl template 1, is extremely stable (Kf=7×1038M−1), but the free macrocycle 4 can be liberated using amine ligands. Spectroscopic data and DFT calculations show that the cyclic hexamer is more conjugated than its linear analogue.