Syntheses, Structures, and Photoluminescent Properties of Lanthanide Coordination Polymers Based on a Zwitterionic Aromatic Polycarboxylate Ligand

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• 作者：Han-Ning Li ; Hai-Yang Li ; Lin-Ke Li ; Li Xu ; Kai Hou ; Shuang-Quan Zang ; Thomas C. W. Mak
• 刊名：Crystal Growth & Design
• 出版年：2015
• 出版时间：September 2, 2015
• 年：2015
• 卷：15
• 期：9
• 页码：4331-4340
• 全文大小：725K
• ISSN：1528-7505

文摘

Three series of lanthanide coordination polymers, {[Ln(L)(H₂O)₂]路NO₃路2H₂O }_n (Ln = La 1, Pr 2), {[Ln₂(L)₂(NO₃)(H₂O)₂]路Cl路6H₂O}_n (Ln = Nd 3), {[Ln(L)(H₂O)₂]路Cl路3H₂O}_n (Ln = Sm 4, Eu 5, Gd 6, Tb 7, Dy 8, Ho 9, Er 10, Tm 11, Yb 12, and Lu 13) (H₃L = 4-carboxy-1-(3,5-dicarboxy-benzyl)-pyridinium chloride), have been successfully synthesized under hydro(solvo)thermally conditions. Single-crystal X-ray diffraction analyses revealed that compounds 1鈥?b>3 all crystallize in triclinic space group P1虆, but they display different three-dimensional structures with diverse dinuclear subunits. In contrast, compounds 4鈥?b>13 display the same layer structures in the triclinic space group P1虆. The structural difference of these two classes of compounds is derived from the effect of lanthanide contraction. Powder X-ray diffraction (PXRD) and thermogravimetric analyses of compounds 1鈥?b>13 have also been investigated and discussed in detail. The solid-state luminescent properties of compounds 4, 5, 7, and 8 were characterized, and the results revealed that they exhibit characteristic Sm(III), Eu(III), Tb(III), and Dy(III) emissions in the pink, red, green, and yellow light regions, respectively. More interestingly, the luminescence colors of the Tb_(1鈥?i>x)(L):xEu can easily be tuned from green to green-yellow, yellow, orange, and red-orange due to the energy transfer from Tb³⁺ to Eu³⁺ ions by adjusting the doping concentration of Eu³⁺ ions.