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Issue 35, 2015
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Pentanuclear lanthanide pyramids based on thiacalix[4]arene ligand exhibiting slow magnetic relaxation

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Abstract

A series of pentanuclear LnIII clusters, [Ln54-OH)(μ3-OH)4(L1)(acac)6] (H4L1 = p-tert-butylthiacalix[4]arene; acac = acetylacetonate; Ln = Dy, Ho, Er) and [Ln55-OH)(μ3-OH)4(L1)(L2)2(acac)2(CH3OH)2] (H3L2 = 5,11,17,23-tetrakis(1,1-dimethylethyl)-25,26,27-trihydroxy-28-methoxy thiacalix[4]arene; Ln = Dy, Ho, Er), have been synthesized based on the thiacalix[4]arene ligand. All of these complexes feature a square-based pyramid with four triangular Ln3 structural motifs. One μ4-OH group bridges four LnIII ions in the basal plane of 1–3, while the OH group in complexes 4–6 adopts the μ5-coordination mode. Our results illuminate the coordination modes of the versatile thiacalix[4]arene ligands and their application to new cluster compounds. The structural and magnetic studies confirm that the molecular symmetries and coordination geometries for lanthanide metal cores have a significant effect on some parameters as single-molecule magnets. Among them, two Dy5 pyramids exhibit distinct slow magnetic relaxation.

Graphical abstract: Pentanuclear lanthanide pyramids based on thiacalix[4]arene ligand exhibiting slow magnetic relaxation

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Supplementary files

Article information


Submitted
01 Jun 2015
Accepted
20 Jul 2015
First published
20 Jul 2015

Dalton Trans., 2015,44, 15481-15490
Article type
Paper
Author version available

Pentanuclear lanthanide pyramids based on thiacalix[4]arene ligand exhibiting slow magnetic relaxation

J. Ge, J. Ru, F. Gao, Y. Song, X. Zhou and J. Zuo, Dalton Trans., 2015, 44, 15481
DOI: 10.1039/C5DT02062J

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