Two dinuclear lanthanide complexes based on a salicylamide imine multidentate ligand: Synthesis, structure and NIR emission properties

Two dinuclear lanthanide complexes based on a salicylamide imine multidentate ligand: Synthesis, structure and NIR emission properties
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基于水杨酰胺亚胺多齿配体的两种双核稀土配合物:合成、结构和近红外发射特性

DOI:
10.1016/j.poly.2019.07.017
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发表时间:
2019-10
期刊:
影响因子:
2.6
通讯作者:
Song Xue Qin
Song Xue Qin
中科院分区:
化学3区
文献类型:
--
作者:
Shamshoom Ali Alhafeez Abdulrheem;Meng Huan Huan;Xi Wei;Song Xue Qin

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以水杨酰胺亚胺多齿配体H3 L = 1-(2-羟基苯甲酰氨基)-2-(3-羟基萘氨基)乙烷为配体,合成了两个双核稀土配合物[Er 2(HL)2(NO3)4]·2CH 3CN·CH 3OH(1)和[Yb 2(HL)2(NO3)4]·3CH 3CN·CH 3OH(2),并通过元素分析、红外光谱、热重分析和X射线衍射对其进行了表征。单晶X射线衍射表明,这两个酚氧原子桥连的双核化合物是类质同象的,其中两个去质子化的HL 2 −配体具有相同的配位模式,萘酚和酰胺氧原子与一个Er(III)离子配位,水杨酰胺的酚氧原子桥连两个Er(III)离子。光物理研究表明,1和2具有Er(III)和Yb(III)离子的近红外发射特性,DFT计算证实了这些有效的敏化作用。结果表明,去质子化的HL 2-不仅对Er(III)和Yb(III)离子提供了良好的保护,而且由于有效的配体-金属能量转移,对Er(III)和Yb(III)离子也表现出良好的天线效应。
Two dinuclear lanthanide complexes, [Er2(HL)2(NO3)4]·2CH3CN∙CH3OH (1) and [Yb2(HL)2(NO3)4]·3CH3CN∙CH3OH (2) based on a salicylamide imine multidentate ligand,H3L= 1-(2-hydroxy-benzamido)-2-(3-hydroxy-naphthaleneamino)-ethane, were prepared and well characterized by elemental analysis, IR spectra, thermogravimetric analysis as well as X-ray diffraction analysis. Single crystal X-ray diffraction shows that the two phenol oxygen atom bridged dinuclear compounds are isomorphous where two deprotonedHL2−ligands possess the same coordination mode with the naphtol and amide oxygen atom coordinating to one Er(III) ion and phenol oxygen atom from salicylamide bridging two Er(III) ions. Photophysical studies indicates that1and2exhibit near-infrared emissions characteristic of Er(III) and Yb(III) ions and these effective sensitizations are approved by DFT calculation. The results presented herein indicate that the deprotonedHL2−not only offers a good protection for Er(III) and Yb(III) ions but also exhibits a good antennae effect with respect to Er(III) and Yb(III) ions as a result of efficient ligand to metal energy transfer.
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