Polarity-dependent solvatochromic properties of thermally activated delayed fluorescence with donor–acceptor constituents under different excitation energies,Journal of Materials Chemistry C

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Polarity-dependent solvatochromic properties of thermally activated delayed fluorescence with donor–acceptor constituents under different excitation energies
Journal of Materials Chemistry C ( IF 5.7 ) Pub Date : 2021-08-27 , DOI: 10.1039/d1tc03044b
Haiyang Xu ₁ , Shuzhe Li ₂ , Minyu Chen _{1,

3,

4} , Yachen Xu _{1,

3} , Pengchao Zhou _{1,

3} , Zhen Zhang _{1,

3} , Yingjie Liao _{1,

3} , Bin Wei _{1,

3}

Affiliation

A novel solvatochromic fluorescent molecule, i.e., DpAn–InAc, is reported and synthesized using a palladium-catalyzed Buchwald–Hartwig cross-coupling process. DpAn–InAc exhibits thermally activated delayed fluorescence character. It has a twisting donor–acceptor configuration, which contributes to interesting solvatochromic properties when changing the excitation energy and the orientational polarizability of the solvent. Fluorescent solvatochromic experiments for DpAn–InAc solutions show a red shift of 90 nm from 540 nm in toluene to 630 nm in tetrahydrofuran. The photoluminescence spectrum of DpAn–InAc in chloroform solution of medium polarity shows dual emission peaks at 450 nm and 550 nm, originating from low-lying local excited (LE) and charge-transfer (CT) states, respectively. When decreasing the excitation energy gradually, it is found that the main excited state of DpAn–InAc changes from the CT state to the LE state. DpAn–InAc has great potential in applications including fluorescent probes and fluorescent sensors.

中文翻译：

在不同激发能量下，具有供体-受体成分的热激活延迟荧光的极性相关溶剂致变色特性

一种新型溶剂致变色荧光分子，即, DpAn-InAc，使用钯催化的 Buchwald-Hartwig 交叉偶联工艺进行报道和合成。DpAn-InAc 表现出热激活延迟荧光特性。它具有扭曲的供体-受体构型，当改变激发能和溶剂的取向极化率时，这有助于产生有趣的溶剂致变色特性。DpAn-InAc 溶液的荧光溶剂化变色实验显示红移 90 nm，从甲苯中的 540 nm 到四氢呋喃中的 630 nm。DpAn-InAc 在中等极性氯仿溶液中的光致发光光谱在 450 nm 和 550 nm 处显示出双发射峰，分别源自低洼的局部激发 (LE) 和电荷转移 (CT) 状态。当逐渐降低激发能时，发现 DpAn-InAc 的主要激发态从 CT 状态变为 LE 状态。DpAn-InAc 在荧光探针和荧光传感器等应用中具有巨大的潜力。

更新日期：2021-09-15

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