Metal-organic frameworks of lanthanide iminodiacetates and tartrates: Synthesis, structural characterization and luminescence properties—Commemorating the 100th anniversary of the birth of Academician Guangxian Xu

• 作者: Melissa Fairley M.M.Varuni S.Livera Wanmin Chen Jorge H.S.K.Monteiro Adam Schmitt Ana de Bettencourt-Dias Sue Roberts Zhiping Zheng
• 来源期刊: 稀土学报（英文版）
• 年，卷（期）: 2021,（5）
• 所属期刊栏目: INVITED ARTICLES
• 页码范围: 487-494
• 页数: 8页
• 语种: 英文

摘要

Two series of lanthanide-containing metal-organic frameworks (Ln-MOFs) of the general formula{[Ln(HIDA)2H2O]ClO4?H2O}n (Ln=La (1), Nd (2), Eu (3), Gd (4), Tb (5), Eu:Tb (6);H2IDA=iminodiacetic acid) and [Ln(TT) (HTT) (H2O)3]n (Ln=Eu (7), Gd (8), Tb (9), Dy (10), and Eu:Tb (11);H2TT=tartaric acid) were synthesized by reacting Ln(ClO4)3 with iminodiacetic acid and L-tartaric acid, respectively. All compounds were structurally characterized by single-crystal X-ray diffraction. Elemental analyses are consistent with the corresponding crystallographically generated formulas. Moreover, the luminescence properties of both the single and mixed-lanthanide complexes were studied. Near infrared, red, and green emissions that are characteristic of Nd(Ⅲ), Eu(Ⅲ), and Tb(Ⅲ) are observed for 2, 3/7, and 5/9, respectively. For the two mixed-lanthanide complex systems 6 and 11, depending on the relative amount of Eu(Ⅲ) and Tb(Ⅲ), the color of emission can be fine-tuned. It is found that a small amount of Eu(Ⅲ) is adequate for the observation of the most intense transition of Eu(Ⅲ). This is believed to be a result of energy transfer from Tb(Ⅲ) to Eu(Ⅲ) within the same complex - a conclusion supported by the signif-icantly shortened lifetime of Tb(Ⅲ) and the accompanying enhanced lifetime of Eu(Ⅲ) in the mixed-lanthanide complex with respect to the corresponding values for the pure Tb(Ⅲ) and Eu(Ⅲ) com-plexes with the same ligand.