The face-to-face zinc porphyrin (2) is a selective host for 4,4′- bipyridyl as compared with the diamines H2N(CH2)nNH2. This selectivety arises from a much higher chelation factor (14M) for the bipyridyl guest as compared with the very low factors (![[double less-than, compressed]](https://www.rsc.org/images/entities/char_2aa1.gif)
M) for the diamines. These results are discussed in terms of host and guest structures and compared with other host–guest systems.
I. P. Danks, I. O. Sutherland and C. H. Yap, J. Chem. Soc., Perkin Trans. 1, 1990, 421 DOI: 10.1039/P19900000421
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