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Ligand field-tuned single-molecule magnet behaviour of 2p-4f complexes

Mei, Xue-Lan ; Ma, Yue ; Li, Li-Cun ; Liao, Dai-Zheng

Dalton transactions (Cambridge, England : 2003), 14 January 2012, Vol.41(2), pp.505-11 [Periódico revisado por pares]

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  • Título:
    Ligand field-tuned single-molecule magnet behaviour of 2p-4f complexes
  • Autor: Mei, Xue-Lan ; Ma, Yue ; Li, Li-Cun ; Liao, Dai-Zheng
  • Assuntos: Magnetics ; Coordination Complexes -- Chemical Synthesis ; Dysprosium -- Chemistry ; Gadolinium -- Chemistry
  • É parte de: Dalton transactions (Cambridge, England : 2003), 14 January 2012, Vol.41(2), pp.505-11
  • Descrição: Three new 2p-4f complexes of [Ln(acac)(3)(NIT-2Py)]·0.5NIT-2Py [Ln(III) = Gd(1), Dy(2)] and [Dy(tfa)(3)(NIT-2Py)]·0.5C(7)H(16) (3) (NIT-2Py = 2-(2'-pyridyl)- 4,4,5,5-tetramethylimidazoline-1-oxyl-3-oxide; acac = acetylacetonate and tfa = trifluoroacetylacetonate) have been synthesized, and structurally and magnetically characterized. The X-ray structural analysis exhibits that the three complexes show similar mononuclear structures, in which NIT-2Py radical chelates the Ln(III) ion through the oxygen atom of the NO group and the nitrogen atom from the pyridine ring. The static magnetic measurements on the three complexes exhibit ferromagnetic coupling between the lanthanide ion and the radical. Compared to the silence of the out-of-phase ac susceptibility of complex 3, the magnetic relaxation behavior of complex 2 is observed, suggesting single-molecule magnet behavior. The different magnetic relaxation behaviours of 2 and 3 are due to their slightly different crystal structure around the...
  • Idioma: Inglês

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