Controlling Metallophilic Interactions in Chiral Gold(I) Double Salts towards Excitation Wavelength-Tunable Circularly Polarized Luminescence
Controlling Metallophilic Interactions in Chiral Gold(I) Double Salts towards Excitation Wavelength-Tunable Circularly Polarized Luminescence
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控制手性金 (I) 双盐中的亲金属相互作用以实现激发波长可调的圆偏振发光
DOI：
10.1002/anie.202000792
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发表时间：
2020
期刊：
影响因子：
--
通讯作者：
Chen Yong
中科院分区：
文献类型：
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作者：
Yang Jian-Gong;Li Kai;Wang Jian;Sun Shanshan;Chi Weijie;Wang Chao;Chang Xiaoyong;Zou Chao;To Wai-Pong;Li Ming-De;Liu Xiaogang;Lu Wei;Zhang Hong-Xing;Che Chi-Ming;Chen Yong
在可见光区表现出激发波长依赖的光致发光（Ex-De PL）的材料在生物成像、光电子学和防伪方面具有潜在的应用。两种多功能手性[Au（NHC）2][Au（CN）2]（NHC=（4 R，5 R）/（4S，5S）-1，3-二甲基-4，5-二苯基-4，5-二氢咪唑啉-2-亚基）配合物复盐在掺杂聚合物薄膜和粉末中显示出Ex-De圆偏振发光（CPL）。通过改变激发波长，可将发射最大值从440 nm动态调谐至530 nm。连续可调谐的光致发光被认为是由于基态存在不同的AuI-AuI距离而产生的多个发射激发态。NHC配体的空间位阻性质对调节AuI的电子-电子-Au I距离至关重要。展示了使用这两种盐的防伪应用。
Materials exhibiting excitation wavelength‐dependent photoluminescence (Ex‐De PL) in the visible region have potential applications in bioimaging, optoelectronics and anti‐counterfeiting. Two multifunctional, chiral [Au(NHC)2][Au(CN)2] (NHC=(4R,5R)/(4S,5S)‐1,3‐dimethyl‐4,5‐diphenyl‐4,5‐dihydro‐imidazolin‐2‐ylidene) complex double salts display Ex‐De circularly polarized luminescence (CPL) in doped polymer films and in ground powder. Emission maxima can be dynamically tuned from 440 to 530 nm by changing the excitation wavelength. The continuously tunable photoluminescence is proposed to originate from multiple emissive excited states as a result of the existence of varied AuI⋅⋅⋅AuIdistances in ground state. The steric properties of the NHC ligand are crucial to the tuning of AuI⋅⋅⋅AuIdistances. An anti‐counterfeiting application using these two salts is demonstrated.