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Controlling Metallophilic Interactions in Chiral Gold(I) Double Salts towards Excitation Wavelength‐Tunable Circularly Polarized Luminescence
Author(s) -
Yang JianGong,
Li Kai,
Wang Jian,
Sun Shanshan,
Chi Weijie,
Wang Chao,
Chang Xiaoyong,
Zou Chao,
To WaiPong,
Li MingDe,
Liu Xiaogang,
Lu Wei,
Zhang HongXing,
Che ChiMing,
Chen Yong
Publication year - 2020
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.202000792
Subject(s) - photoluminescence , luminescence , excitation wavelength , excitation , excited state , wavelength , materials science , photochemistry , steric effects , ground state , optoelectronics , chemistry , atomic physics , stereochemistry , physics , quantum mechanics
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 Au I ⋅⋅⋅Au I distances in ground state. The steric properties of the NHC ligand are crucial to the tuning of Au I ⋅⋅⋅Au I distances. An anti‐counterfeiting application using these two salts is demonstrated.