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An Europium (III) Luminophore with Pressure-Sensing Units: Effective Back Energy Transfer in Coordination Polymers with Hexadentate Porous Stable Networks.
ChemPlusChem ( IF 3.4 ) Pub Date : 2020-08-04 , DOI: 10.1002/cplu.202000513
Yasuchika Hasegawa 1, 2 , Takuya Sawanobori 2 , Yuichi Kitagawa 1, 2 , Sunao Shoji 2 , Koji Fushimi 2 , Yuta Nakasaka 2 , Takao Masuda 2 , Ichiro Hisaki 3
Affiliation  

A luminescent EuIII coordination polymer with O2‐sensing units under air, EuIII‐hcpt (hcpt: 2,3,6,7,10,11‐hexakis(4‐carboxy‐phenyl)triphenylene), is reported. The hexadentate carboxylic acids in hcpt ligands play an important role in the formation of tight‐packed three‐dimensional networks in EuIII‐hcpt, giving hyper thermo‐stable structures (decomposition temperature=420 °C). The three‐dimensional porous network promotes bright luminescence (4f–4f emission quantum yield=70 %). The emission lifetime of EuIII‐hcpt under vacuum (0.86 ms) was twice as large as that under O2 (0.48 ms, 1 atom:101.3 kPa). The Arrhenius analysis of the emission decay profile indicates that the back energy transfer (BEnT) from the emitting level of the europium(III) ion to the excited T1 state of the hcpt ligand should be activated at room temperature. The gradual decrease of emission lifetime is caused by the BEnT process in EuIII‐hcpt. Finally, an advanced pressure‐sensitive luminophore is demonstrated.

中文翻译:

带有压力传感单元的((III)发光体:具有六齿多孔稳定网络的配位聚合物中的有效背能量转移。

据报道,一种在空气中具有O 2传感单元的发光Eu III配位聚合物Eu III- hcpt(hcpt:2,3,6,7,10,11-六(4-羧基-苯基)三亚苯基)。hcpt配体中的六齿羧酸在Eu III- hcpt中紧密堆积的三维网络的形成中起着重要作用,提供了超高温稳定的结构(分解温度= 420°C)。三维多孔网络可促进明亮的发光(4f-4f发射量子产率= 70%)。Eu III- hcpt在真空(0.86 ms)下的发射寿命是O 2下的两倍(0.48毫秒,1原子:101.3 kPa)。发射衰减曲线的Arrhenius分析表明,从the(III)离子的发射能级到hcpt配体的激发T 1状态的背能量转移(BEnT)应在室温下激活。发射寿命的逐渐减少是由于Eu III- hcpt中的BEnT过程引起的。最后,展示了一种先进的压敏发光体。
更新日期:2020-09-02
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