Abstract
Two novel tetrahedral Mn (II) halide single-crystals [(C7H10N)2][MnCl4] (1) and [(C7H10N)2][MnBr4] (2), based on pyridine ionic liquids, have been successfully prepared. Centimeter-sized single crystal 2 was grown through bottom seed-solution temperature-lowering method, while the 1 was synthesized by solvent slow evaporation. Structure elucidation results indicate that the two crystals crystallize in the different space groups of the same monoclinic system. Significantly, the solid crystal 2 is possessed of superior luminescence properties than 1 at room temperature. Excited by ultraviolet light, the 1 and 2 emit intense green emission bands derived from the Mn (II) 4T(G) energy level. The fluorescent lifetimes are 384.43 and 187.83 μs, respectively, and quantum yields are 82% and 12%, respectively. Furthermore, under the excitation of X-ray, the 2 exhibits prominent X-ray fluorescence performance.
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Acknowledgements
This work is partially supported by the National Natural Science Foundation of China (Grant No. 61775108 and 11475242). The authors gratefully acknowledge the teacher Xu Wei and his graduate student for their support on the crystal structure testing and analysis. The authors also thank the reviewers for their constructive comments and suggestions.
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Li, L., Li, L., Li, Q. et al. Synthesis, crystal structure and optical property of manganese (II) halides based on pyridine ionic liquids with high quantum yield. Transit Met Chem 45, 413–421 (2020). https://doi.org/10.1007/s11243-020-00393-w
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DOI: https://doi.org/10.1007/s11243-020-00393-w