Article Dans Une Revue Inorganic Chemistry Année : 2025

Slow Relaxation of Magnetization in a Nitronyl Nitroxide-Co–Tb Coordination Network with Linear Heptanuclear [Tb7(NIT)6(H2O)2] Clusters

Résumé

Ln–Co coordination networks formed with a tridentate nitronyl nitroxide radical linker, namely, {[Ln7(hfac)21Co2(hfac)4(NIT-PhCN)6(H2O)2]·0.5NIT-PhCN}n (LnIII = Gd 1, Tb 2; NIT-PhCN = 2-(4-cyanophenyl)-4,4,5,5-tetramethylimidazoline-3-oxide-1-oxyl), are reported. These unique coordination networks exhibit an unprecedented structural motif in which six NIT units bridge seven Ln(III) ions to produce linear [Tb7(NIT)6(H2O)2] spin clusters. These are further linked to Co(II) ions by the coordination of CN groups of the radicals, resulting in 2D-coordination networks. DC magnetic susceptibilities of the two complexes are consistent with discrete [Ln7(NIT)6(H2O)2] magnetic units and reveal predominant ferromagnetic interactions between the Ln-NIT centers. The Tb derivative is a zero-field SMM with an SCM-type relaxation process that is thermally activated (Ueff/kB = 27.1 K).

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hal-05216108 , version 1 (20-08-2025)

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Chao-Yi Jin, Qiuxue Zhang, Virginie Béreau, Peng Cheng, Licun Li, et al.. Slow Relaxation of Magnetization in a Nitronyl Nitroxide-Co–Tb Coordination Network with Linear Heptanuclear [Tb7(NIT)6(H2O)2] Clusters. Inorganic Chemistry, 2025, 64 (28), pp.14336-14342. ⟨10.1021/acs.inorgchem.5c01536⟩. ⟨hal-05216108⟩
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