Abstract
Two rare two-dimensional Ln-radical networks, namely, [{Ln(tfa)3}3(NIT-4Py)2]n [LnIII = Gd 1 and Tb 2; tfa- = trifluoroacetylacetonato; and NIT-4Py = 2-(4-pyridyl)-4,4,5,5-tetramethylimidazoline-1-oxyl-3-oxide], have been successfully constructed and characterized. In these complexes, each NIT-4Py radical functions as a tridentate ligand to ligate three Ln ions, creating a 2D network with linear five-spin [Ln3(NIT)2] nodes. Ferromagnetic Ln-NO interactions govern the characteristic magnetic behavior of a finite spin system. The Tb complex is shown to exhibit SMM behavior in a zero DC field, with an energy barrier for spin flipping of 53 K and hysteretic M-H behavior at 2.3 K, with a coercive field Hcoer = 110 Oe. This complex represents the first example of a Ln-nitronyl nitroxide SMM-based network.
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