This presentation will describe our efforts to synthesize molecule-based magnets with strong magnetic exchange coupling by employing benzoquinonoid radical bridging ligands. In particular, a series of tetraazalene radical-bridged dinuclear complexes has been synthesized. Magnetic measurements of these complexes reveals the presence of strong antiferromagnetic exchange between MII centers and radical, with estimated coupling constants of J = −157 (Mn), −307 (Fe), −396 (Co), and J = −626 (Ni) cm−1. The Fe congener behaves as a single-molecule magnet with a spin relaxation barrier of Ueff = 52(1) cm−1. In addition, the synthesis and magnetic properties of a wheel-like cluster comprised of six MnII ions linked by six radical ligands will be discussed. Finally, this presentation will present a new benzoquinonoid-bridged MnII chain compound, which can undergo solid-state ligand-based redox-switching, and a 2D semiquinoid radical-containing microporous magnet with solvent-induced switching from Tc = 26 to 80 K.

Semiquinoid radical-containing molecules and solids with strong magnetic exchange coupling

251st National Meeting (2016)

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