Ferromagnetically coupled dinuclear MII complexes based on a boratriazine ligand framework

Abstract

A boratriazine ligand, which incorporates attractive features from both bodipy and terpy, has been used to synthesize [Fe₂^II(μ_1,1-N₃)₂(Py₂F₂BTA)₂(N₃)₂] (1) and [Co₂^II(μ_1,1-N₃)₂(Py₂F₂BTA)₂(N₃)₂] (2). Both 1 and 2 feature a double end-on azido bridging motif, which promotes ferromagnetic interactions between the metal centres. Indeed, 1 represents the first report of a dinuclear Fe^II complex with this bridging mode exhibiting J = 5.7(9) cm⁻¹ and D = −6.0(4) cm⁻¹, while the isostructural Co analogue shows J = 7.1(9) cm⁻¹ and D = 17.3(9) cm⁻¹.