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首页> 外文期刊>Inorganic Chemistry Frontiers >Heteroleptic beta-diketonate Ln(iii) complexes decorated with pyridyl substituted pyridazine ligands: synthesis, structure and luminescence properties
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Heteroleptic beta-diketonate Ln(iii) complexes decorated with pyridyl substituted pyridazine ligands: synthesis, structure and luminescence properties

机译：用吡啶基取代哒嗪配体装饰的异孔β-二酮酯LN（III）配合物：合成，结构和发光性能

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摘要

A substituted pyridazine was used to construct a family of mononuclear heteroleptic complexes [Ln(tta)(3)(dppn)], Ln = Pr-Lu; Htta = thenoyltrifluoroacetone; dppn = 3,6-di(2-pyridyl)pyridazine. All the complexes obtained were characterized by CHN elemental analysis, NMR spectroscopy, ESI mass spectrometry, FTIR spectroscopy and single crystal X-ray analysis. The photophysical properties of lanthanide complexes were carefully investigated, and the dppn ligand was found to act as a chromophore centre to sensitize metal-centred emission of the Nd, Sm, Eu, and Yb complexes under UV excitation. It has been shown that a powder sample of the Eu complex can contain two isomers with somewhat different symmetries of the environment of the metallocentre. The mechanism for the emission of luminescent Nd, Sm, Eu, and Yb complexes was investigated by TDDFT calculations and the results confirmed the conclusion made on the basis of experimental data regarding the likely pathway of energy transfer from the chromophore centre to the emissive level of Ln(iii).
机译：使用取代的哒嗪用于构建单核异质络合物[LN（TTA）（3）（DPPN）]，LN = PR-Lu的家族。 htta = theoyltrifluoroacetone; DPPN = 3,6-二（2-吡啶基）哒嗪。所获得的所有配合物的特征在于CHN元素分析，NMR光谱，ESI质谱，FTIR光谱和单晶X射线分析。仔细研究了镧系元素复合物的光物理性质，发现DPPN配体用作发色团，以使UV激发下的Nd，Sm，欧盟和Yb复合物的金属居中发射敏化。已经表明，欧盟络合物的粉末样品可含有两种异构体，其具有稍微不同的Metallocentre环境的对称性。通过TDDFT计算研究了发光ND，SM，EU和YB复合物的发射机制，结果证实了基于关于从发色团到发射水平的发射水平的能量转移途径的实验数据的结论ln（iii）。

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