Synthesis and complexes of a constrained-cavity Schiff-base dipyrrin macrocycle

Abstract

A new constrained-cavity [1 + 1] Schiff-base dipyrrin macrocycle comprising an N₄ donor-pocket has been synthesised by spontaneous oxidation and in situ crystallisation. Access to Fe(II) and Zn(II) complexes is achieved by salt elimination reactions of the lithium salt. All compounds have been characterised by NMR and UV-vis spectroscopy, X-ray crystallography, and DFT analysis.