Eight Cd(II) coordination polymers with persistent room-temperature phosphorescence: intriguing dual emission and time-resolved afterglow modulation,Inorganic Chemistry Frontiers

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Eight Cd(II) coordination polymers with persistent room-temperature phosphorescence: intriguing dual emission and time-resolved afterglow modulation
Inorganic Chemistry Frontiers ( IF 6.1 ) Pub Date : 2019/12/06 , DOI: 10.1039/c9qi01273g
Yajie Li _{1,

2,

3} , Tianyu Gai _{1,

2,

3} , Yuejin Lin _{1,

2,

3} , Wenjing Zhang _{1,

2,

3} , Kai Li _{1,

2,

3} , Yan Liu _{1,

2,

3} , Yanquan Duan _{1,

2,

3} , Baojun Li _{1,

2,

3} , Jie Ding _{1,

2,

3} , Jinpeng Li _{1,

2,

3}

Affiliation

In this work, a new series of coordination polymers (CPs) 1–8 were designed and successfully synthesized; they displayed typical afterglow at room temperature under ambient conditions. In 1–4, single green phosphorescence was observed, where the T₂ (π, π*) state was stabilized by the π-stacking interactions of the phosphorescent group tynca⁻, which contributed to enhancing their luminescence lifetimes. In contrast, when the π-stacking interaction of the phosphorescent group tynca⁻ was absent in the rigid matrix, 5–8 exhibited an intriguing time-resolved afterglow modulation, in which yellow [T₁ (n, π*), short lifetime] and green [T₂ (π, π*), long lifetime] phosphorescences were sequentially observed during the decay process when the common UV light was turned off. As one of the representatives of long-lived dual phosphorescent CPs, the promising optical properties of 8 allowed it to be used in logos for advanced anti-counterfeiting systems. To the best of our knowledge, this special and rare afterglow modulation has not been reported in the literature for persistent RTP (p-RTP) CP systems, and further exploration in this area may open a new door for newly emerging technologies such as optical recording and encryption or multimodal bio-imaging.

中文翻译：

八种具有持续室温磷光的Cd（II）配位聚合物：引人入胜的双重发射和时间分辨的余辉调制

在这项工作中，设计并成功合成了一系列新的配位聚合物（CP）1-8。他们在室温和环境条件下显示出典型的余辉。在1-4时，观察到单个绿色磷光，中T ₂（π，π*）状态是由磷光基团的π堆叠相互作用稳定tynca ^-，这有助于提高其发光寿命。相反，当该磷光基团的π堆叠相互作用tynca ^-是在刚性基质不存在，5-8表现出吸引人的时间分辨余辉调制，其中黄色[T ₁（N，π*），短寿命]和绿色[T当关闭公共紫外线时，在衰减过程中顺序观察到₂（π，π*）长寿命的磷光。作为长寿命的双重磷光CP的代表之一，其有前途的光学特性8使其可以用于高级防伪系统的徽标中。据我们所知，这种特殊而罕见的余辉调制在持久RTP（ p -RTP）CP系统中尚未见报道，在这一领域的进一步探索可能会为诸如光记录之类的新兴技术打开一扇新的大门。以及加密或多模式生物成像。

更新日期：2020-02-13

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