Circular Dichroism and Multiphoton Circularly Polarized Luminescence Switching Using a Bis-perylene Diimide Macrocycle.

ABSTRACT: Chiroptical switches exhibit stimuli-induced changes in the sign or strength of their circular dichroism (CD) or circularly polarized luminescence (CPL) and are materials with significant potential for chiroptical sensing and biological imaging. However, the chromophores used in chiroptical materials usually require excitation by ultraviolet or visible light, which results in higher cytotoxicity and lower penetration compared to near-infrared (NIR) photoexcitation. This can be overcome by multiphoton excitation, yet multiphoton CPL (MP-CPL) has been challenging to measure in organic emitters. Core-twisted perylene diimides (PDIs) are excellent chromophores with which to develop MP-CPL emitters due to a chiral π-system capable of two-photon absorption. Furthermore, the integration of these

SUBMITTER: Penty SE 

PROVIDER: S-EPMC12451419 | biostudies-literature | 2025 Sep

REPOSITORIES: biostudies-literature