Effect of auxiliary-ligand on assembly of lanthanide(III) complexes with quinoline-2-carboxylic acid: Synthesis, structure, photoluminescent and magnetic properties

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• 作者：Junwei Ye^a ; ^{junweiye@dlut.edu.cn} ; Qianqian Wang^a ; Hongze Gao^b ; Xinyi Lu^a ; Weitao Gong^a ; Yuan Lin^a ; Guiling Ning^a ; ^{ninggl@dlut.edu.cn}
• 关键词：Lanthanide complexes ; Quinoline-2-carboxylate ; Dinuclear structure ; Chain ; Photoluminescence ; Magnetism
• 刊名：Inorganica Chimica Acta
• 出版年：2012
• 出版时间：1 April, 2012
• 年：2012
• 卷：384
• 期：Complete
• 页码：1-7
• 全文大小：1584 K

文摘

A series of lanthanide complexes [Ln₂(QUIN)₆(H₂O)₆]¡¤3H₂O (Ln = Pr (1), Nd (2), Sm (3), Eu (4)), [Pr(QUIN)₃(H₂O)]_n (5) and [Pr₂(QUIN)₄(phen)₂(NO₃)₂(H₂O)₂] (6) were synthesized by hydrothermal reactions of corresponding lanthanide nitrates with quinoline-2-carboxylic acid (HQUIN) under intervention of auxiliary ligands, and characterized by elemental analysis, IR, TGA and single-crystal X-ray diffraction. Complexes 1-4 and 6 exhibit the dinuclear lanthanide architectures in which each Ln(III) ion is nine-coordinated and possesses distorted tricapped trigonal prism geometry. The dinuclear structures in 1-4 are further linked by the hydrogen bond interactions resulting in the formation of the two-dimensional supramolecular network, while the dinuclear structures in 6 form the three-dimensional supramolecular network. Complex 5 is composed of one-dimensional chain framework, which further pack into the two-dimensional layer through weak ¦Ð?¦Ð stacking interactions. The supramolecular architectures 1-6 show that the numerous hydrogen bonds are responsible for the increasing thermal stability. Photoluminescence investigation reveals that complexes 4 and 6 display strong red and green emission, respectively. Moreover, the magnetic properties of 2 and 6 have also been investigated.