Two novel tetrahedral Mn (II) halide single-crystals [(C 7 H 10 N) 2 ][MnCl 4 ] ( 1 ) and [(C 7 H 10 N) 2 ][MnBr 4 ] ( 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) 4 T(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.

中文翻译：

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基于高量子产率吡啶离子液体的卤化锰的合成、晶体结构和光学性质

两种新型四面体 Mn (II) 卤化物单晶 [(C 7 H 10 N) 2 ][MnCl 4 ] ( 1 ) 和 [(C 7 H 10 N) 2 ][MnBr 4 ] ( 2 )，基于吡啶离子液体，已成功制备。厘米大小的单晶2通过底部晶种溶液降温法生长，而1通过溶剂缓慢蒸发合成。结构解析结果表明，两种晶体在同一单斜晶系的不同空间群中结晶。值得注意的是，固体晶体2在室温下具有比1更好的发光特性。在紫外光的激发下，1 和 2 发出来自 Mn (II) 4 T(G) 能级的强烈绿色发射带。荧光寿命分别为 384.43 和 187.83 μs，量子产率分别为 82% 和 12%。此外，