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Series of Highly Luminescent Macrocyclic Sm(III) Complexes: Functional Group Modifications Together with Luminescence Performances in Solid-State, Solution, and Doped Poly(methylmethacrylate) Film

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posted on 23.10.2019, 13:07 by Kun Zhang, Ze-Ying Lu, Cheng-Cheng Feng, Zhuo-Ran Yang, Peng-Peng Nie, Ting-Ting Chen, Lin-Feng Zhang, Shuang Ma, Yin-Jing Shen, Meng-Lu Lin
Here, we report our trials to regulate the luminescence performance of the macrocyclic samarium­(III) complex and prepare four excellent luminescent Sm­(III) complex-doped poly­(methylmethacrylate) (PMMA) composites. Four 23-membered [1 + 1] Schiff-base macrocyclic mononuclear Sm­(III) complexes, Sm-2aSm-2d, originating from dialdehydes with different pendant arms and 1,2-bis­(2-aminoethoxy)­ethane, have been constructed by the template method. Crystal structures reveal that every Sm­(III) ion with the coordination geometry of a distorted bicapped square antiprism is capsulated by the macrocyclic cavity environment forming the “lasso-type” protection. Relative photophysical properties of macrocyclic Sm­(III) complexes are carefully investigated in solid-state, methanol solution, and doped PMMA film, and all these show characteristic emissions of the Sm­(III) ion associated with satisfactory lifetimes and quantum yields in all media, which could be comparable to reported outstanding examples. Especially, the luminescence performance for this type of Sm­(III) complex could be regulated in the solid state by the use of different functional groups in the pendant arm while it is not achieved in solution and the doped PMMA composite. High emitting and air-stable plastic materials could be obtained when these Sm­(III) complexes are doped in PMMA with 0.1 wt % mixing ratio, and the corresponding maximum lifetime and quantum yield are 61.2 μs and 0.63% in the case of complex Sm-2a, respectively. We believe that these highly luminescent “lasso-type” Sm­(III) complexes and doped PMMA composites are valuable references in the design of luminescent lanthanide­(III) hybrid materials.