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首页> 外文期刊>Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics >Spectroscopic studies of lanthanide picrate complexes with N,N-dimethylacetamide. Structure of the La compound
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Spectroscopic studies of lanthanide picrate complexes with N,N-dimethylacetamide. Structure of the La compound

机译：镧系元素苦味酸盐与N，N-二甲基乙酰胺配合物的光谱研究。 La化合物的结构

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摘要

Emission and excitation spectra were recorded for the complexes Ln(pic)(3).3(DMA) (pic=picrate, DMA=N,N-dimethylacetamide, Ln=La, Eu, Gd, Sm, Lu). The Eu and Sm complexes exhibit f-f characteristic luminescence spectra, while the other present broad emission bands are due to picrate anion luminescence. Both emission and excitation spectra of the Eu compound point to a small participation of the D-5(1) state in the emission process. Lifetimes for these luminescences were measured. Their values (in the range of ms) suggest a strong mixing of the singlet and triplet states of the ligands, as well as a fast transfer to the D-5(0) and (4)G(5/2) states of Eu and Sm, respectively. For the Sm complex doped with Eu, small variations in the lifetimes were observed. Luminescence quantum yields were also determined. Single-crystal X-ray analysis of the La complex shows a D-3h symmetry around the central ion. (C) 1998 Elsevier Science S.A. [References: 17]
机译：记录了配合物Ln（pic）（3）.3（DMA）（pic = picrate，DMA = N，N-N-dimethylacetamide，Ln = La，Eu，Gd，Sm，Lu）的发射光谱和激发光谱。 Eu和Sm配合物表现出f-f特征发光光谱，而其他存在的宽发射带归因于苦味酸根阴离子发光。 Eu化合物的发射光谱和激发光谱都表明D-5（1）态在发射过程中的参与很小。测量了这些发光的寿命。它们的值（在ms范围内）表明配体的单重态和三重态强烈混合，并且快速转移到Eu的D-5（0）和（4）G（5/2）态和Sm分别。对于掺有Eu的Sm络合物，观察到其寿命有很小的变化。还确定了发光量子产率。 La络合物的单晶X射线分析显示中心离子周围具有D-3h对称性。 （C）1998 Elsevier Science S.A. [参考：17]

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