Three-Dimensional Extended Frameworks Constructed from Dinuclear Lanthanide(III) 1,4-Naphthalenedicarboxylate Units with Bis(2,2鈥?biimidazole) Templates: Syntheses, Structures, and Magnetic and Lumine

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• 作者：Ying-Bing Lu ; Fang-Mei Jian ; Shuang Jin ; Jun-Wei Zhao ; Yong-Rong Xie ; Guo-Tian Luo
• 刊名：Crystal Growth & Design
• 出版年：2014
• 出版时间：April 2, 2014
• 年：2014
• 卷：14
• 期：4
• 页码：1684-1694
• 全文大小：639K
• 年卷期：v.14,no.4(April 2, 2014)
• ISSN：1528-7505

文摘

Eight unprecedented Ln-NDC coordination polymers with BBI as templates {[HBBI][Ln(NDC)₂(H₂O)]路H₂O [Ln = La (1), Pr (2)], [HBBI]₂[Sm(NDC)₂(H₂O)]₂路1/2H₂O (3), and [HBBI][Ln(NDC)₂(H₂O)] [Ln = Eu (4), Gd (5), Tb (6), Dy (7), Er (8)] [Ln = lanthanide, H₂NDC = 1,4-naphthalenedicarboxylic acid, BBI = bis(2,2鈥?biimidazole)]} have been hydrothermally synthesized and structurally characterized by elemental analyses, IR spectra, and single-crystal X-ray diffraction. Complexes 1鈥?b>8 crystallize in the monoclinic space group P2₁/c and display similar (8,8)-connected 3-D frameworks with different dinuclear Ln secondary building units due to the effect of Ln contraction and diverse coordination modes of NDC^{2鈥?/sup> ligands. As the ionic radii of Ln ions decrease, the coordination numbers of Ln ions decrease from 10, to 9, to 8. The variable-temperature magnetic properties of 2鈥?b>8 have been investigated. The strong fluorescent emissions of 4 demonstrate that ligand-to-EuIII energy transfer is efficient. In addition, thermogravimetric analyses and optical diffuse reflectance spectra of these compounds are also described.}