Octahedral erbium and ytterbium ion encapsulated in phosphorescent iridium complexes showing field-induced magnetization relaxation

Four isostructural heptanuclear clusters [LnIr6(ppy)12(bpp)2(bppH)4](CF3SO3)·xH2O (Ir6Ln, Ln = Eu, Tb, Er, Yb) are reported, where the lanthanide ions are six-coordinated by the phosphonate oxygen donors from six [Ir(ppy)2(bpp)] (ppy− = 2-phenylpyridine, bpp2− = 2-pyridylphosphonate) chromophores. A...

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Bibliographic Details
Published in:Journal of magnetism and magnetic materials 2019-08, Vol.484, p.139-145
Main Authors: Zeng, Dai, Fan, Kun, Wang, Lu-Ping, Bao, Song-Song, Ren, Min, Zheng, Li-Min
Format: Article
Language:English
Subjects:
5d-4f complex
Chromophores
Erbium
Iridium
Iridium compounds
Lanthanide
Luminescence
Magnetization
Phosphonate
Phosphonates
Phosphorescence
Single ion magnet
Ytterbium
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Summary:Four isostructural heptanuclear clusters [LnIr6(ppy)12(bpp)2(bppH)4](CF3SO3)·xH2O (Ir6Ln, Ln = Eu, Tb, Er, Yb) are reported, where the lanthanide ions are six-coordinated by the phosphonate oxygen donors from six [Ir(ppy)2(bpp)] (ppy− = 2-phenylpyridine, bpp2− = 2-pyridylphosphonate) chromophores. All show phosphorescence originating from the IrIII moieties. For compounds Ir6Er and Ir6Yb, field-induced slow magnetization relaxation is also observed, thus providing the first examples of Ir-Er or Ir-Yb complexes showing bifunctional phosphorescence and field-induced single ion magnet behaviors.
ISSN:0304-8853
1873-4766
DOI:10.1016/j.jmmm.2019.03.100