Synthesis of a Neo-Confused Octaphyrin and the Formation
of Its Mononuclear Complexes
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Abstract
Novel neo-confused octaphyrin(1.1.1.1.1.1.1.0)
(<b>1</b>)
was synthesized by oxidative ring closure of an octapyrrane bearing
two terminal “confused” pyrroles. Crystal structures
of its Zn(II) and Cu(II) complexes (<b>2</b> and <b>3</b>) show a figure-of-eight conformation with unique mononuclear coordination
structures. Photophysical data and theoretical calculations suggest
that the neo-confused octaphyrin <b>1</b> is a 34π electron
conjugated species showing nonaromaticity. Coordination of copper
and zinc ions results in the further narrowing of the HOMO–LUMO
gaps
