Abstract
AbstractChirality is ubiquitous within biological systems where many of the roles and functions are still undetermined. Given this, there is a clear need to design and develop sensitive chiral optical probes that can function within a biological setting. Here we report the design and synthesis of magnetically responsive Circularly Polarized Luminescence (CPL) complexes displaying exceptional photophysical properties (quantum yield up to 31 % and |glum| up to 0.240) by introducing chiral substituents onto the macrocyclic scaffolds. Magnetic CPL responses are observed in these chiral EuIII complexes, promoting an exciting development to the field of magneto‐optics. The |glum| of the 5D0 → 7F1 transition increases by 20 % from 0.222 (0 T) to 0.266 (1.4 T) displaying a linear relationship between the Δglum and the magnetic field strength. These EuIII complexes with magnetic CPL responses, provides potential development to be used in CPL imaging applications due to improved sensitivity and resolution.
Highlights
Chirality plays an essential role in all living matter, it can be observed from macroscopic to microscopic worlds, from human hands to natural amino acids
This work builds on earlier publications of Riehl and Richardson, both of them studied the induced magnetic circularly polarized luminescence (MCPL) under static external magnetic field from naturally optically inactive probes, and lately by Yoshikawa et al.[23,24,25]
As postulated, applying an external magnetic field induced stronger Circularly Polarized Luminescence (CPL) signals and higher glum values were obtained for EuL2–7 with obvious trends in MCPL enhancement, making these EuIII complexes suitable as magneto-optical probes.[26, 27]
Summary
Chirality plays an essential role in all living matter, it can be observed from macroscopic to microscopic worlds, from human hands to natural amino acids. We report the design and synthesis of magnetically responsive Circularly Polarized Luminescence (CPL) complexes displaying exceptional photophysical properties (quantum yield up to 31 % and j glum j up to 0.240) by introducing chiral substituents onto the macrocyclic scaffolds.
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