The first examples of metallacycles containing rare earth ions bridged by radicals are reported. The molecular triangles [Ln 3 (hfac) 6 (bptz •– ) 3 ] (Ln = Dy III, Y III; hfac = 1,1,1,5,5,5-hexafluoro-2,4-pentanedionate; bptz = 3,6-bis(2-pyridyl)-1,2,4,5-tetrazine) consist of lanthanide ions bridged by bptz radical anion (bptz •– ) ligands. Magnetic susceptibility measurements and CASSCF calculations performed on [Dy 3 (hfac) 6 (bptz •– ) 3 ] reveal the presence of antiferromagnetic coupling between the Dy III centers and the bptz •– ligands, with J = −6.62 cm –1 .
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Dolinar et al. (2017) studied this question.
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