Steric interactions of the substituents weaken the strong NH … N hydrogen bonds (typical for porphycenes) in 1 (R = Me, Et) by increasing the N … N distance. As a consequence the coordination of metal ions, in particular of Zn2+ ions, is facilitated. These findings can be expected to give impetus to the research into metalloporphycenes.
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Vogel et al. (1993) studied this question.
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