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Dinuclear Tb and Dy complexes supported by hybrid Schiff-base/calixarene ligands: synthesis, structures and magnetic properties

Hahn, P.; Ullmann, S.; Klose, J.; Peng, Y.; Powell, A. K.; Kersting, B.

The synthesis of the new lanthanide complexes [HNEt$_{3}$][Dy$_{2}$(HL$^{1}$)(L$^{1}$)] (5), and [Ln$_{2}$(L$_{2}$)$_{2}$] (Ln = Tb$^{III}$ (7), Dy$^{III}$ (8)) supported by the hybrid Schiff-base/calix[4]arene ligands H$_{4}$L$^{1}$ (25-[2-((2-methylphenol)imino)ethoxy]-26,27,28-trihydroxy-calix[4]arene) and H$_{3}$L$^{2}$ (25-[2-((2-methylpyridine)imino)ethoxy]-26,27,28-trihydroxy-calix[4]arene) are reported. Spectroscopic data (for 5) and X-ray crystallographic analysis (for 7·4MeCN, 8·4MeCN) reveal the presence of dimeric structures, featuring doubly-bridged NO$_{4}$Ln(μ-O)$_{2}$LnO$_{4}$N (5) or N$_{2}$O$_{3}$Ln(μ-O)$_{2}$LnO$_{3}$N$_{2}$ cores (7, 8) with seven-coordinated Ln$^{3+}$ ions. The magnetic properties of polycrystalline samples of 5, 7 and 8 were studied by variable temperature dc and ac magnetic susceptibility measurements. The χ′′(T) vs. T plots show no maxima in zero field, but the maxima can be detected under a 3 kOe dc field. The relaxation times τ obey the Arrhenius law above 5 K. Anisotropy barriers of ∼18 cm$^{-1}$ (26 K) for 5 and ∼23 cm$^{-1}$ (33 K) for 8 were determined.

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Verlagsausgabe §
DOI: 10.5445/IR/1000123389
Veröffentlicht am 08.09.2020
DOI: 10.1039/d0dt02209h
Zitationen: 1
Web of Science
Zitationen: 1
Zitationen: 1
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Anorganische Chemie (AOC)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2020
Sprache Englisch
Identifikator ISSN: 0300-9246, 1364-5447, 1470-479X, 1472-7773, 1477-9226, 1477-9234, 2050-5671
KITopen-ID: 1000123389
Erschienen in Dalton transactions
Verlag Royal Society of Chemistry (RSC)
Band 49
Heft 31
Seiten 10901-10908
Nachgewiesen in Web of Science
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