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基于共轭吡啶羧酸酯配体的镧系配合物：结构、发光及磁性

Lanthanide complexes based on a conjugated pyridine carboxylate ligand: structures, luminescence and magnetic properties.

作者信息

Li Rong-Fang, Li Rui-Hao, Liu Xin-Fang, Chang Xin-Hong, Feng Xun

机构信息

College of Chemistry and Chemical Engineering, Henan Key Laboratory of Function Oriented Porous Materials, Luoyang Normal University Luoyang Henan 471934 China

出版信息

RSC Adv. 2020 Feb 10;10(11):6192-6199. doi: 10.1039/c9ra10975g. eCollection 2020 Feb 7.

DOI:10.1039/c9ra10975g
PMID:35496023
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC9049638/
Abstract

Three lanthanide compounds have been synthesized, namely, {[Dy(bpda)(HO)]·2HO}(Dy-1), {[Sm(bpda)·(HO)]·HO} (Sm-2) and {[Tb(bpda)(HO)]·2HO} (Tb-3) (Hbpda = 2,2'-bipyridine-6,6'-dicarboxylic acid). Their structures were determined by single crystal X-ray diffraction and characterized by elemental analysis, infrared spectroscopy and thermogravimetric analysis. Dy-1 and Tb-3 are isostructural with a conjugate bimolecular four-nuclear cluster structure constructed with intramolecular hydrogen bonds and they form a 3D supramolecular structure with intermolecular hydrogen bonding. Sm-2 is a one-dimensional chain structure and is further connected by intricate hydrogen bonds into a three-dimensional supramolecular structure. These three compounds exhibit significant characteristic luminescence from the ligand to the central Ln(iii) ion, which is found by solid-state photoluminescence measurement. Sm-2 exhibits a long luminescence lifetime and high fluorescence quantum yield. A slow relaxation phenomenon is observed for the dysprosium compound by measuring the alternating-current susceptibility at low temperature and the underlying mechanism was further confirmed by theoretical calculations.

摘要

已经合成了三种镧系化合物，即{[Dy(bpda)(HO)]·2HO}(Dy-1)、{[Sm(bpda)·(HO)]·HO} (Sm-2) 和{[Tb(bpda)(HO)]·2HO} (Tb-3)（Hbpda = 2,2'-联吡啶-6,6'-二羧酸）。通过单晶X射线衍射确定了它们的结构，并通过元素分析、红外光谱和热重分析对其进行了表征。Dy-1和Tb-3是同构的，具有由分子内氢键构建的共轭双分子四核簇结构，并且它们通过分子间氢键形成三维超分子结构。Sm-2是一维链状结构，并通过复杂的氢键进一步连接成三维超分子结构。通过固态光致发光测量发现，这三种化合物从配体到中心Ln(iii)离子都表现出显著的特征发光。Sm-2表现出长发光寿命和高荧光量子产率。通过在低温下测量交流磁化率，观察到镝化合物存在慢弛豫现象，并且理论计算进一步证实了其潜在机制。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/b09a/9049638/a850b3238e89/c9ra10975g-f8.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/b09a/9049638/6a4f9de957c6/c9ra10975g-f1.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/b09a/9049638/4b2bbb6c088e/c9ra10975g-f3.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/b09a/9049638/17a1b500d9a9/c9ra10975g-f4.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/b09a/9049638/db4ce8b82fd7/c9ra10975g-f5.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/b09a/9049638/5d4ada1e8bf5/c9ra10975g-f6.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/b09a/9049638/29bec9fcf645/c9ra10975g-f7.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/b09a/9049638/a850b3238e89/c9ra10975g-f8.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/b09a/9049638/6a4f9de957c6/c9ra10975g-f1.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/b09a/9049638/b5162a564b4b/c9ra10975g-f2.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/b09a/9049638/4b2bbb6c088e/c9ra10975g-f3.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/b09a/9049638/17a1b500d9a9/c9ra10975g-f4.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/b09a/9049638/db4ce8b82fd7/c9ra10975g-f5.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/b09a/9049638/5d4ada1e8bf5/c9ra10975g-f6.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/b09a/9049638/29bec9fcf645/c9ra10975g-f7.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/b09a/9049638/a850b3238e89/c9ra10975g-f8.jpg

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