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Thiacalix[4]arene-supported mononuclear lanthanide compounds: slow magnetic relaxation in dysprosium and erbium analogues

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Abstract

Four mononuclear lanthanide compounds, [Ln(TC4A-di-OMe)(LOEt)] (Ln = Tb (1); Dy (2); Ho (3); Er (4)), were synthesized based on a thiacalix[4]arene derivative (H2TC4A-di-OMe = 5,11,17,23-tetrakis(1,1-dimethylethyl)-25,27-dihydroxy-26,28-dimethoxy thiacalix[4]arene) and one auxiliary ligand (LOEt = (η5-cyclopentadienyl)tris-(diethylphosphito-p)cobaltate(III)). Compounds 1–4 were characterized using single crystal X-ray structural analysis and magnetization measurements. The Ln(III) ion features a seven-coordinated {LnO7} environment, capped by one bowl-shaped thiacalix[4]arene ligand and one tripodal LOEt ligand. Magnetic measurements reveal that dysprosium compound 2 shows a characteristic two-step relaxation process while erbium compound 4 behaves as a field-induced single-molecule magnet with a higher energy barrier at 31.7 K. The mononuclear erbium-based compound based on the macrocyclic multidentate thiacalix[4]arene ligand is rarely observed in molecular magnets.

Graphical abstract: Thiacalix[4]arene-supported mononuclear lanthanide compounds: slow magnetic relaxation in dysprosium and erbium analogues

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Publication details

The article was received on 08 Aug 2018, accepted on 27 Sep 2018 and first published on 29 Sep 2018


Article type: Paper
DOI: 10.1039/C8NJ04016H
Citation: New J. Chem., 2018, Advance Article
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    Thiacalix[4]arene-supported mononuclear lanthanide compounds: slow magnetic relaxation in dysprosium and erbium analogues

    J. Ge, Z. Chen, H. Wang, H. Wang, P. Wang, X. Duan and D. Huo, New J. Chem., 2018, Advance Article , DOI: 10.1039/C8NJ04016H

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