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首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >Spectroscopic studies of lanthanide complexes of varying nuclearity based on a compartmentalised ligand
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Spectroscopic studies of lanthanide complexes of varying nuclearity based on a compartmentalised ligand

机译：基于间隔配体的不同核镧系元素配合物的光谱研究

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摘要

The synthesis, characterization and solid-state luminescence spectroscopy of mononuclear (f), heterodinuclear (d-f) and heterotrinuclear (d-f-d) coordination compounds with the compartmental ligand N, N'-bis(3-hydroxyl salicylidene) benzene-1,2-diamine (H2L) are reported. The trivalent lanthanide ions Nd-III, Sm-III, Eu-III, Gd-III, Tb-III and Dy-III as single metal centres or in combination with either Zn-II or Ni-II were coordinated. Compounds are characterised by elemental analyses, IR, 1D and 2D solution H-1 and C-13 NMR spectroscopy, measurements of magnetic moments and solid state UV-Vis-NIR reflectance, luminescence and Raman spectroscopy techniques. Crystal structures of the dinuclear compounds [SmZn-(O2NO) (3)(L)(OH2)]center dot EtOH and [DyZn(O2NO)(2)(Cl)(L)(EtOH)]center dot 3EtOH and the trinuclear compound [TbZn2(L)(2)(Cl)(2)(OH2)](NO3)center dot EtOH are presented, where samarium(III) displays a coordination number of ten, with a bicapped cubic geometry, while for the dysprosium compound a nine-coordinated environment with a tricapped trigonal prismatic geometry is shown. Their crystals belong to the triclinic system and the P (1) over bar space group. The coordination number for terbium(III) in the trinuclear complex is nine, with a tricapped trigonal prismatic geometry, and its crystal belongs to the monoclinic system, space group C2/c. For these three compounds, the zinc ion stabilises a penta-coordinated environment with square pyramid geometry. All mononuclear and dinuclear compounds are neutral, whereas the trinuclear complexes are ionic. The results of DFT theoretical calculations for the ligand (H2L) are used to assign the ligand singlet and triplet excited state energy levels. Luminescence studies of the neodymium compounds indicate that the ligand is a sensitizer for NIR emitters.
机译：单核（f），异双核（df）和异三核（dfd）配位化合物N，N'-双（3-羟基水杨基）苯-1,2-二胺配位化合物的合成，表征和固态发光光谱（H2L）报告。三价镧系元素离子Nd-III，Sm-III，Eu-III，Gd-III，Tb-III和Dy-III作为单一金属中心或与Zn-II或Ni-II结合使用。化合物的特征在于元素分析，IR，1D和2D溶液H-1和C-13 NMR光谱，磁矩和固态UV-Vis-NIR反射率的测量，发光和拉曼光谱技术。双核化合物[SmZn-（O2NO）（3）（L）（OH2）]中心点EtOH和[DyZn（O2NO）（2）（Cl）（L）（EtOH）]中心点3EtOH和三核的晶体结构给出了化合物[TbZn2（L）（2）（Cl）（2）（OH2）]（NO3）中心点EtOH，其中sa（III）的配位数为10，具有二阶立方几何形状，而for为displays图中显示了具有三重三角形棱柱几何形状的九坐标环境。它们的晶体属于三斜晶系和bar空间群上的P（1）。三核络合物中ter（III）的配位数为9，具有三棱柱状棱柱形几何形状，其晶体属于单斜晶系，空间群C2 / c。对于这三种化合物，锌离子稳定具有方形金字塔几何形状的五配位环境。所有单核和双核化合物都是中性的，而三核络合物是离子的。 DFT配体（H2L）理论计算的结果用于指定配体单重态和三重态激发态能级。钕化合物的发光研究表明，该配体是NIR发射体的敏化剂。

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