Large shape-persistent metal-invertible 15-Nsp2-donor-atom macrocycles functioning as trinucleating ligands

Abstract

Reaction of 4,6-dihydrazinopyrimidines with 2,6-dicarbonylpyridines produces, under metal-free or template conditions, a new class of [3 + 3] macrocycles with 15 Nsp² donor atoms. Nine Nsp² atoms are on the external circumference of the macrocycle. The macrocycle can bind metal ions and produce trinuclear complexes along with the motion of the nine outer Nsp² atoms to inner positions (a motion of inversion of the macrocycle).