A triple-triangle cluster derived from a simple tridentate ligand

Abstract

The heptanuclear ferric cluster, [Fe^III₇(O)₆(HL)₅(H₂L)(H₂O)₈](BF₄)₄ (H₂L = 2,6-bis(1,5-diphenyl-1H-pyrazol-3-yl)pyridine), was synthesized by the reaction of the planar tridentate ligand H₂L with iron(II) tetrafluoroborate hexahydrate. The cluster has a corner-shared triple-triangle core structure connected by three μ-O atoms, and it has a spin-frustrated ferrimagnetic spin ground state of S = 19/2.