Highly two-photon and X-ray excited long-persistent luminescence in a crystalline host-guest aggregate  

作　　者：Qiang-Sheng Zhang Xiao-Dong Zhang Jia-Yi Zhuang Mei Pan 

机构地区：[1]MOE Laboratory of Bioinorganic and Synthetic Chemistry,Lehn Institute of Functional Materials,IGCME,GBRCE for Functional Molecular Engineering,School of Chemistry,Sun Yat-Sen University,Guangzhou,P.R.China [2]Hainan Provincial Key Laboratory of Fine Chem,School of Chemistry and Chemical Engineering,Hainan University,Haikou,P.R.China

出　　处：《Aggregate》2024年第2期328-335,共8页聚集体（英文）

基　　金：NKRD Program of China,Grant/Award Number:2021YFA1500401;Local Innovative and Research Teams Project of Guangdong Pearl River Talents Program,Grant/Award Number:2017BT01C161;National Natural Science Foundation of China,Grant/Award Numbers:22171291,92261114,21821003,21890380。

摘　　要：As a unique type of supramolecular self-assemblies,crystalline host-guest aggregates have attracted extensive interests in multiple application fields.Herein,a crystalline host-guest aggregate LIFM-HG1 was obtained with curcubit[8]uril as the host and carboxypyridinium salt as the guest.Single-crystal structural analysis indicates that the presence of abundant weak interactions in LIFM-HG1 provides a rigid environment for the guest molecule and effectively blocks the external quenchers.Spectral analysis and theoretical calculations confirm the presence of robust triplet energy levels in LIFM-HG1.Even more impressively,the intersystem crossing channels of the guest molecules are greatly opened up after the formation of the crystalline host-guest aggregate,resulting in a large k_(isc)of 6.70×10^(7)s^(−1)at room temperature for LIFM-HG1(which is∼0 for pure guest),leading to fascinatingmultichannel(including one-photon,two-photon,and X-ray)excited LPL properties.In addition,the crystalline LIFM-HG1 has a much higher triplet state luminescence efficiency under X-ray and two-photon excitation than that under single-photon excitation(A_(P)/A_(F)=86.8,44.8,10.7 under the three circumstances,respectively).And the phosphorescent emission intensity of LIFM-HG1 is 27.6 times higher than that of the crystalline guest under X-ray excitation.As a result,LIFM-HG1 shows a long afterglow retention time under both single-and two-photon excitation,and an impressive afterglow retention time of 1 s under X-ray excitation.Furthermore,the excellent lysosomal targeting and low cytotoxicity by the formation of host-guest aggregate makes LIFM-HG1 promising to be used as a novel lysosomal-targeted two-photon excited phosphorescent tracer.

关 键 词：crystalline host-guest aggregate long-persistent luminescence TWO-PHOTON X-ray excited 

分 类 号：O43[机械工程—光学工程]