New coordination polymers based on a V-shaped ligand and lanthanides: Structural description and symmetry-luminescence correlation using europium as a probe

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• 作者：Rodrigo da Silva Viana^a ; Jaroslaw Chojnacki^b ; Eduardo Henrique Lago Falcã ; o^a ; Severino Alves Junior^a ; ^{salvesjr@ufpe.br}
• 关键词：Coordination polymers ; 4 ; 4׳-Sulfonyldibenzoic acid ; Lanthanide ions ; Optical materials ; Symmetry-Luminescence
• 刊名：Journal of Luminescence
• 出版年：2017
• 出版时间：February 2017
• 年：2017
• 卷：182
• 期：Complete
• 页码：29-38
• 全文大小：1946 K
• 卷排序：182

文摘

We have synthesized new luminescent coordination polymers using 4,4׳-sulfonyldibenzoic acid (H2SDA) and several lanthanide ions by open crystallization in DMF. Three different 1-D structures were obtained, as determined by single-crystal X-ray diffraction: [La(η2-NO3)(μ-SDA)(DMF)3]n (1), [Sm(η2-NO3)(μ-SDA)(DMF)2·2DMF]n (3), [Ln(η2-NO3)(μ-SDA)(DMF)2·DMF]n (Ln = Eu (4), Dy (5), Ho (6), Er (7), Tm (8) and Lu (9)). A 2-D structure, [Er2(η2-SDA)3(DMF)(H2O)3·2DMF]n (10), was also obtained. The measured photophysical properties of these compounds seem to be interesting for applications (high lifetime, narrow line width and high degree of color purity). In addition, emission spectra, spontaneous emission coefficients (Arad and Anrad), and intensity parameters (Ω2 and Ω4), from spectroscopic data of Eu3+, were used to evaluate crystal stabilities. Differences in the spectra acquired before and after DMF removal clearly reflected the changes taking place in the ion environment.