A series of metalloporphyrin-containing cyclic hosts has been prepared, which are electronically and geometrically programmed to recognize guests in a particular configuration. Electronic control is achieved by substituting the C–H meso positions with carbonyl groups, while geometric control is possible in the choice of the length of the rigid acetylene porphyrin linkers.
Z. Clyde-Watson, N. Bampos and J. K. M. Sanders, New J. Chem., 1998, 22, 1135 DOI: 10.1039/A805504A
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