Circularly polarized luminescence switch based on a photochromic europium(III) helicate derived coordination polymer

Chiroptical switches based on circularly polarized luminescence (CPL) have shown the promising appli-cations in advanced information technologies. Herein, a pair of lanthanide coordination polymer enan-tiomers [Eu2(LR)3(BTFPO)2]n and [Eu2(LS)3(BTFPO)2]n with light-regulated CPL property are designed, which are assembled by a chiral binuclear triple-stranded Eu3 + helicates [Eu2(LR/S)3] coordinated with two photochromic triphenylphosphine oxides (BTFPO). Upon the alternative UV and 526 nm light irradia-tion, the complexes show the reversible photochromism, PL and CPL responses. Notably, the luminescence dissymmetry factor, glum of 5D0 -> 7F1 (591 nm) transition shows an obvious increase from 0.19 to 0.29 before and after 275 nm light irradiation. Additionally, the emission from Eu3 + center is not completely quenched in closed-ring state due to the low photocyclization ( CYRILLIC CAPITAL LETTER EFo-c) quantum yield of the polymer. The partial maintenance of emissive intensity is of essential importance for the monitor of CPL signal. More importantly, the CPL photo-switching property of the complexes in solid hybrid film is maintained, and still displays the enhanced CPL emission in photostationary state. Further, the potential applications of the doping film in logic gate and anti-counterfeiting were investigated.(c) 2023 Published by Elsevier B.V. on behalf of Chinese Chemical Society and Institute of Materia Medica, Chinese Academy of Medical Sciences.

Automated summary

Chiroptical switches based on circularly polarized luminescence (CPL) have shown promising applications in advanced information technologies. In this study, a pair of lanthanide coordination polymer enantiomers with light-regulated CPL property were designed and exhibited reversible photochromism, PL, and CPL responses. The CPL photo-switching property of the complexes in solid hybrid film was maintained and displayed enhanced CPL emission.