Ratiometric Fluorescence Detection of Mg2+ Based on Regulating Crown-Ether Modified Annihilators for Triplet–Triplet Annihilation Upconversion

• DOI: 10.1021/acs.jpcb.2c00928
• Publication Date: 2022-03-29T17:59:02Z
• Authors: Lin Li; Yilei Ding; Chun Zhang; Haiyu Xian; Shuoran Chen; Guoliang Dai; Xiaomei Wang; Changqing Ye
• Keywords: Photon Upconversion

Detection of magnesium ion has been great significance considering its critical physiological activities. Herein, we report ratiometric fluorescence detection Mg2+ with high sensitivity and selectivity based on triplet-triplet annihilation (TTA) upconversion for the first time. Crown-ether functionalized anthracene derivatives were synthesized, which bifunctionally acted as not only annihilators to construct TTA systems but also recognition probes photoinduced electron transfer (PET) mechanism. Their photophysical properties absence presence comprehensively studied. It was found that solvents strongly influenced Mg2+-responsiveness. PtOEP sensitizer further established investigated. turned out PtOEP/9-AEC in DCM exhibited an excellent linear relationship (R2 = 0.9979) between intensity ratio (the integrated upconverted luminescence (IUC) over downshifted phosphorescence (IPL), IUC/IPL) concentration under excitation 532 nm a limit value 2.52 μM Mg2+. This work opened new perspective designs applications TTA-upconversion-based detection.