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首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >Slow magnetic relaxation in Co-II-Ln(III) heterodinuclear complexes achieved through a functionalized nitronyl nitroxide biradical
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Slow magnetic relaxation in Co-II-Ln(III) heterodinuclear complexes achieved through a functionalized nitronyl nitroxide biradical

机译:通过官能化氮氮氧化物型抗体实现的Co-II-LN(III)杂核配合物中的缓慢磁性弛豫

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摘要

A new nitronyl nitroxide biradical ligand NITPh-PyPzbis (5-(3-(2-pyridinyl)-1H-pyrazol-1-yl)-1,3-bis(1'-oxyl-3'-oxido-4',4',5',5'-tetramethyl-4,5-hydro-1H-imidazol-2-yl)benzene) has been successfully applied for constructing a 3d-4f Co-II-Ln(III) system, giving rise to a family of novel hetero-tri-spin complexes, namely, [LnCo(hfac)(5)(NITPh-PyPzbis)]center dot CH2Cl2 (LnCo = YCo 1, GdCo 2, TbCo 3, DyCo 4, and HoCo 5; hfac = hexafluoroacetylacetonate). In these hetero-tri-spin complexes, the NITPh-PyPzbis biradical chelates one Ln(III) and one Co-II simultaneously by means of its adjacent aminoxyl moieties and two N donors from the 3-(2-pyridinyl)-1H-pyrazol-1-yl unit, respectively, realizing the unique biradical-Co-Ln heterodinuclear structure. Direct-current magnetic susceptibility investigations show that antiferromagnetic coupling is predominant in the YCo derivative, while the leading magnetic interaction in the GdCo analogue is ferromagnetic. Alternating-current data for the DyCo complex display visible temperature/frequency-dependent chi'' peaks, indicating the SMM behavior. In the fluorescence spectra, four characteristic emission bands of the Tb-III ion have been detected for the TbCo analogue.
机译:一种新的氮硝基氧化物型肌肌肌肌Nitph-pypzbis(5-(3-(2-吡啶基)-1H-吡唑-1-基)-1,3-双(1'- oxyl-3'-oxido-4',4 ',5',5'-四甲基-4,5-氢-1H-咪唑-2-基)苯)已成功应用于构建3D-4F CO-II-LN(III)系统,产生a新型杂杂环旋转复合物,即[LNCO(HFAC)(5)(尼氏型)]中心点CH2CL2(LNCO = YCO 1,GDCO 2,TBCO 3,DYCO 4和HOCO 5; HFAC =六氟乙酰丙酮)。在这些异质三旋转络合物中,通过其相邻的氨基氧基部分和来自3-(2-吡啶基)-1H-吡唑的两种供体同时含有1NPH-型β(III)和一个CO-II。 -1-yl单元,分别实现独特的均力型CO-LN异调核结构。直流磁化率研究表明,反铁磁耦合在YCO衍生物中是主要的,而GDCO模拟中的主要磁相互作用是铁磁性的。 DYCO复合物显示可见温度/频率相关的CHI'峰的交流数据,表示SMM行为。在荧光光谱中,已检测到TBCO模拟的四个特征发射带。

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