We have a longstanding interest in using organic radical ligands to bridge metal spins with the goal of engendering strong magnetic exchange coupling. Recently we targeted dinuclear complexes in which two transition metal centers are bridged by the radical anion form of the tetrazine-based ligand bmtz (bmtz = 3,6-bis(2’-pyrimidyl)-1,2,4,5-tetrazine). Several new compounds of the type [(M(TPMA))2-μ-bmtz-](X)3 (M = Co, Ni; TPMA = tris(2-pyridylmethyl)amine, X = O3SCF3-, BF4-) (Figure 1) have been prepared and their magnetic properties evaluated. Both of these complexes exhibit strong magnetic exchange coupling, with the nickel complex exhibiting ferromagnetic metal-radical coupling. The magnetic properties of the cobalt complex are too complicated to be described by a simple metal-radical coupling approach but there is dominant antiferromagnetic coupling. Interestingly these molecules behave as Single Molecule Magnets in the presence of an applied DC field. This presentation will discuss our efforts to expand this series of model compounds to the remaining first-row transition metals as well as theoretical studies to aid in the fundamental understanding of the magnetic properties of these complexes.

Dinuclear complexes as model systems to explore magnetic coupling through tetrazine-based radical ligands

249th National Meeting (2015)

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