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Synthesis of a Neo-Confused Octaphyrin and the Formation of Its Mononuclear Complexes

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posted on 02.10.2015, 00:00 authored by Kai Zhang, Junda Zhang, Xin Li, Rui Guo, Hans Ågren, Zhongping Ou, Masatoshi Ishida, Hiroyuki Furuta, Yongshu Xie
Novel neo-confused octaphyrin(1.1.1.1.1.1.1.0) (1) was synthesized by oxidative ring closure of an octapyrrane bearing two terminal “confused” pyrroles. Crystal structures of its Zn­(II) and Cu­(II) complexes (2 and 3) show a figure-of-eight conformation with unique mononuclear coordination structures. Photophysical data and theoretical calculations suggest that the neo-confused octaphyrin 1 is a 34π electron conjugated species showing nonaromaticity. Coordination of copper and zinc ions results in the further narrowing of the HOMO–LUMO gaps.

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