The importance of π–π donor–acceptor interactions is demonstrated in the synthesis and conformation of macrocyclic porphyrin dimers covalently linked by biphenyl or pyromellitimide bridges.
C. A. Hunter, M. N. Meah and J. K. M. Sanders, J. Chem. Soc., Chem. Commun., 1988, 692 DOI: 10.1039/C39880000692
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