Synthesis, Structure, and Photoluminescence of Color-Tunable and White-Light-Emitting Lanthanide Metal–Organic Open Frameworks Composed of AlMo6(OH)6O183– Polyanion and Nicotinate

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• 作者：Huanyao Ji ; Xiaomin Li ; Donghua Xu ; Yunshan ZhouLijuan Zhang ; Zareen Zuhra ; Shaowei Yang
• 刊名：Inorganic Chemistry
• 出版年：2017
• 出版时间：January 3, 2017
• 年：2017
• 卷：56
• 期：1
• 页码：156-166
• 全文大小：645K
• ISSN：1520-510X

文摘

A series of isostructural compounds Na(HL)(CH₃COO)Ln(Al(OH)₆Mo₆O₁₈)(H₂O)₆·10H₂O [L = nicotinate; Ln = Eu (1), Tb (2)] and Na(HL)(CH₃COO)Eu_mTb_nLa_1–m–n(AlMo₆(OH)₆O₁₈)(H₂O)₆·10H₂O (3–8, L = nicotinate), wherein Anderson-type polyanions AlMo₆(OH)₆O₁₈^3– as basic inorganic building blocks are connected by Eu(CH₃COO)(HL)(H₂O)₃]₂⁴⁺ and [Na₂(H₂O)₈]²⁺ cations, resulting in formation of three-dimensional lanthanide metal–organic open frameworks, were synthesized successfully with AlCl₃·6H₂O, Na₂MoO₄·2H₂O, nicotinic acid, and lanthanide nitrates as starting materials. The compounds were characterized by UV–vis, IR, elemental analysis, powder XRD, and TG–DTA measurements. The single-crystal structures of compounds 1 and 2 show that the two compounds display three-dimensional open frameworks with 1D channels along the b and c axes. Investigation of the energy transfer mechanism indicated that the organic nicotinate ligand can transfer energy efficiently to Tb³⁺ rather than Eu³⁺. The influence of the POM moiety on the fluorescence of the compounds is also studied. Compounds 1–8 exhibit tunable luminescence color, and emitting of white light was realized through adjusting the molar ratio of Eu:Tb:La within the compounds.