Luminescence color change of [3,4-difluoro-2,6-bis(5-methyl-2-pyridyl)phenyl-κ3N,C1,μ′]cyanidoplatinum(II) by aggregation
Luminescence color change of [3,4-difluoro-2,6-bis(5-methyl-2-pyridyl)phenyl-κ3N,C1,μ′]cyanidoplatinum(II) by aggregation
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[3,4-二氟-2,6-双(5-甲基-2-吡啶基)苯基-κ3N,C1,μ]氰基铂(II)聚集引起的发光颜色变化
DOI：
10.1039/d2dt02360a
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发表时间：
2022
影响因子：
4
通讯作者：
Kazuteru Shinozaki
中科院分区：
文献类型：
--
作者：
Shingo Hattori;Takumi Nakano;Nanako Kobayashi;Yuri Konno;Eiji Nishibori;Tomasz Galica;Kazuteru Shinozaki
研究了新型Pt（L）CN（L = 4，6-二氟-1，3-二（2-（4-甲基）吡啶基）苯）在溶液和晶态中聚集诱导发光（AIE）引起的颜色和发光颜色的变化。在溶液状态下，AIE是由高浓度激发态的激基缔合物和三聚体形成的结果。我们测定了激基缔合物和三聚体的发射寿命分别为τE = 1.72 μs和τT = 0.43 μs，发射量子产率分别为τM = 8.85 μs和τ M = 67%。在结晶状态下，没有结晶溶剂的Pt（L）CN的紫色在暴露于氯仿蒸气时变为红色，并且不可见发射变为明亮的红色发射。这一现象可应用于廉价的氯仿快速检测装置。将紫色晶体暴露于二氯甲烷蒸气中，导致不可见发射的进一步红移和蓝色着色，这表明氯仿与二氯甲烷的区分能力。
We have investigated the color and luminescence color changes of novel Pt(L)CN (L = 4,6-difluoro-1,3-di(2-(4-methyl)pyridyl)benzene) in solution and crystalline states that resulted from aggregation-induced emission (AIE). In the solution state, the AIE results from excimer and trimer formation in the excited states at high concentrations. We determined the emission lifetimes of the excimer and trimer to be τE = 1.72 μs and τT = 0.43 μs, respectively, and the emission quantum yields to be ϕE = 20% and ϕT = 12%, respectively, which are slightly smaller yet comparable to τM = 8.85 μs and ϕM = 67% of the monomeric species. In the crystalline state, the purple color of Pt(L)CN with no solvent of crystallization changes to red upon exposure to chloroform vapor, and the invisible emission turns to bright red emission. This phenomenon can be applied to inexpensive devices for the fast chloroform detection. The exposure of purple crystals to dichloromethane vapor causes a further redshift of the invisible emission and blue coloration, which suggests the capability of the discrimination of chloroform from dichloromethane.