Syntheses, structures and near-infrared luminescent properties of a series of Ln(III) coordination polymers

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• 作者：Yu-Xian Chi^a ; Yu-Juan Liu^a ; Ye Li^a ; Ru Wang^a ; Jing Jin^a ; Guang-Ning Zhang^b ; Shu-Yun Niu^a ; ^{syniu@sohu.com}
• 关键词：Lanthanide(III) polymers ; Near-infrared luminescence ; Crystal structure
• 刊名：Journal of Molecular Structure
• 出版年：2012
• 期刊代码：62_00222860
• 类别：ch
• 出版时间：27 June, 2012
• 卷：1018
• 期：Complete
• 页码：122-130
• 文件大小：1511 K

摘要

Using aromatic carboxylic acids as main ligands, four Ln(III) coordination polymers, [Er(CH₃C₆H₄COO)₂(Ac)(H₂O)]_n (1), [Yb(尾-C₁₀H₇COO)₂(Ac)(H₂O)]_n (2), [Nd(C₉H₇O₂)₃]_n (3) and [Ho(C₉H₇O₂)₃]_n (4) (CH₃C₆H₄COO = p-toluylate, Ac = acetate, 尾-C₁₀H₇COO = 尾-naphthoyloxy, C₉H₇O₂ = cinnamate), were synthesized by hydrothermal method and their structures were studied by single-crystal X-ray diffraction. Polymers 1 and 2 possess 2D layer structures, and polymers 3 and 4 possess 1D chain structures. At room temperature in the solid state, the IR, UV-Vis-NIR spectra and the emission spectra in the visible and near-infrared (NIR) regions of the four polymers were determined. In the NIR region, polymers 1-4 show characteristic emission bands of the corresponding Ln(III) ions which exhibit shift, splitting or broadness in comparison with their theoretical emission bands. This can be confirmed by their UV-Vis-NIR spectra and discussed emphatically.