Syntheses, crystal structures, magnetic and luminescence properties of five novel lanthanide complexes of nitronyl nitroxide radical

Syntheses, crystal structures, magnetic and luminescence properties of five novel lanthanide complexes of nitronyl nitroxide radical
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五种新型硝基硝基氧自由基配合物的合成、晶体结构、磁性和发光性质

DOI:
10.1016/j.jssc.2013.03.052
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发表时间:
2013-06
影响因子:
3.3
通讯作者:
Liao, Dai-Zheng
Liao, Dai-Zheng
中科院分区:
化学3区
文献类型:
--
作者:
Wang, Ya-Li;Gao, Yuan-Yuan;Ma, Yue;Wang, Qing-Lun;Li, Li-Cun;Liao, Dai-Zheng

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合成了5个新的氮氧自由基配合物[Ln(hfac)3(NITPh-3-Br-4-OMe)2](Ln(III)=Eu(1),Gd(2),Tb(3),Dy(4),Ho(5); hfac=六氟乙酰丙酮; NITPh-3-Br-4-OMe=2-3′-Br-4′-甲氧基苯基-4,4,5,5-四甲基咪唑啉-1-氧基-3-氧化物).单晶结构分析表明,这些配合物具有相似的单核三自旋结构,中心Ln(III)离子均为八配位,分别与三个hfac分子和两个NITPh-3-Br-4-OMe自由基配位.变温磁化率研究揭示了配合物1、2、3和5中顺磁离子(Ln(III)和自由基)之间的反铁磁相互作用以及配合物4中的铁磁相互作用。本文还研究了配合物Eu(1),Tb(3)和Dy(4)的发光特性。
Five novel Ln(III) complexes based on a new nitronyl nitroxide radical have been synthesized, characterized structurally and magnetically: [Ln(hfac)3(NITPh-3-Br-4-OMe)2] (Ln(III)=Eu(1), Gd(2), Tb(3), Dy(4), Ho(5); hfac=hexafluoroacetylacetonate; and NITPh-3-Br-4-OMe=2-3′-Br-4′-methoxyphenyl-4,4,5,5-tetramethylimidazoline-1-oxyl-3-oxide). The single-crystal structures analyses show that these complexes have similar mononuclear tri-spin structures, in which central Ln(III) ions are all eight coordinated by three hfac molecules and two NITPh-3-Br-4-OMe radicals. The variable-temperature magnetic susceptibility studies reveal the antiferromagnetic interactions between the paramagnetic ions (Ln(III) and radicals) in complexes 1, 2, 3 and 5 and ferromagnetic interaction in complex 4. The luminescence characterizations of complexes Eu(1), Tb(3) and Dy(4) are also studied in this paper.
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