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Long-range spin dependent delocalization promoted by the pseudo Jahn-Teller effect. | LitMetric
Strong spin-dependent delocalization (double exchange) was previously demonstrated for the complexes, NN-Bridge-SQ-Co(py)Cat-Bridge-NN (where NN = S = 12 nitronylnitroxide, Bridge = 1,4-phenylene and single bond, SQ = S = 12 orthobenzosemiquinone, Co = low-spin d cobalt 3+, and Cat = diamagnetic catecholate). The mixed-valent S = 12 SQ-Co-Cat triad results in ferromagnetic alignment of localized (pinned) NN spins which are ∼22 Å apart (Bridge = Ph). Herein, we report similar ferromagnetic coupling of localized verdazyl (Vdz) radical spins. The origin of the magnetic exchange results from a second order vibronic effect (pseudo Jahn-Teller effect) in [Vdz-diox-Ru(py)-diox-Vdz], which possesses a diamagnetic [diox-Ru-diox] triad by virtue of strong antiferromagnetic SQ-Ru exchange.
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