Slow magnetic relaxation in ladder-type and single-strand 2p–3d–4f heterotrispin chains

Meng Yang (1) , Jing Xie (1) , Zan Sun (1) , Licun Li (1) , J.-P. Sutter (2)

1 Department of Chemistry Nankai University
2 LCC - Laboratoire de chimie de coordination

Ladder-type and chain 2p–3d–4f complexes based on a bridging nitronyl nitroxide radical, namely, [LnCu(hfac)5(NIT-Ph-p-OCH2trz)]·0.5C6H14 [Ln = Y (1a), Dy (1b)] and [LnCu(hfac)5(NIT-Ph-p-OCH2trz)] [Ln = Y (2a), Dy (2b); NIT-Ph-p-OCH2trz = 2-[4-[(1H-1,2,4-triazol-1-yl)methoxy]phenyl]-4,4,5,5-tetramethylimidazoline-1-oxyl-3-oxide; hfac = hexafluoroacetylacetonate) have been successfully achieved through a one-pot reaction of the NIT-Ph-p-OCH2trz radical with Cu(hfac)2 and Ln(hfac)3·2H2O. Complexes 1a and 1b feature a ladder-like structure, where the rails are made of Ln(III) and Cu(II) ions alternatively bridged by nitronyl nitroxide and the triazole units while the NIT-Ph-p-OCH2trz moieties act as the rungs of the ladder. Complexes 2a and 2b consist of one-dimensional nitronyl nitroxide bridged Ln coordination polymers with dangly Cu(II) units connected to the triazole moieties. All of compounds exhibit ferromagnetic NIT-Dy and/or NIT-Cu interactions. Both Dy derivatives (1b and 2b) show frequency-dependent out-of-phase magnetic susceptibility signals in a zero field indicating slow magnetic relaxation behavior.

Domaines: Chimie de coordination

Meng Yang, Jing Xie, Zan Sun, Licun Li, J.-P. Sutter. Slow magnetic relaxation in ladder-type and single-strand 2p–3d–4f heterotrispin chains. Inorganic Chemistry, 2017, 56 (21), pp.13482-13490. ⟨10.1021/acs.inorgchem.7b02204⟩. ⟨hal-01946865⟩