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A family of lanthanide compounds based on nitronyl nitroxide radicals: synthesis, structure, magnetic and fluorescence properties

机译:基于硝酰基氮氧自由基的镧系元素化合物:合成,结构,磁性和荧光性质

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A series of lanthanide nitronyl nitroxide radical compounds, [Ln(hfac)3(NITPh-p-N(CH3)2)2xC7H16 (Ln = La (1), Eu (2), Gd (3), Tb (4), Dy (5), Er (6), hfac = hexafluoroacetylacetonate; NITPh-p-N(CH3)2 = 4′-dimethylamino-phenyl-4,4,5,5-tetramethylimidazoline-1-oxyl-3-oxide, x = 2/3 for complexes 1, 2, 3 and 6, and 0 for 4 and 5), have been synthesized and structurally characterized. X-Ray crystallographic analyses show that the structures of the six compounds are similar and all consist of isolated molecules, in which central Ln(III) ions are coordinated to six oxygen atoms from three hexafluoroacetylacetonate ligands and two oxygen atoms from nitronyl nitroxide radicals. Variable-temperature magnetic susceptibility studies reveal ferromagnetic interactions between the Gd(III) ion and nitronyl nitroxide radical in complex 3. Ac magnetic susceptibility measurements of complexes 4 and 5 exhibit frequency-dependent out-of-phase signals, indicating single-molecule magnet (SMM) behavior.
机译:一系列镧系亚硝酰基氮氧自由基化合物[Ln(hfac) 3 (NITPh- p -N(CH 3 2 2 x C 7 H 16 (Ln = La(1),Eu(2),Gd(3) ,Tb(4),Dy(5),Er(6),hfac =六氟乙酰丙酮; NITPh- p -N(CH 3 2 = 4'-二甲基氨基-苯基-4,4,5,5-四甲基咪唑啉-1-氧基-3-氧化物, x =已经合成并在结构上表征了配合物1、2、3和6的2/3和4和5的0)。 X射线晶体学分析表明这6种化合物的结构相似,并且全部由孤立的分子组成,其中中心Ln( III )离子与3个六氟乙酰丙酮酸配体和2个氧原子上的6个氧原子配位硝酰基氮氧自由基产生的原子。可变温度磁化率研究表明,配合物3中的Gd( III )离子与亚硝酰氮氧自由基之间存在铁磁相互作用。复合物4和5的交流磁化率测量显示出频率相关的异相信号,表示单分子磁体(SMM)的行为。

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