Stepwise π-extension of double [5]helicene diimides to planar nanographene diimides.

ABSTRACT: A facile, stepwise synthetic route has been developed to access symmetric double [5]helicene diimides and their planar nanographene diimide counterparts via a C-shaped asymmetric [5]helicene. The synthetic strategy employs benzannulation and Scholl reaction methodologies to achieve progressive π-extension, yielding a new class of n-type rylene diimides with reversible redox characteristics. These helical and planar diimides exhibit variable crosswise π-conjugation and structural tunability, resulting in emission wavelengths that can be tailored alongside enhanced photoluminescence quantum yields-from 12% for the S-shaped diimide, to 57% for the C-shaped intermediate, and up to 63% for the fully planar nanographene diimide. Such properties make them promising candidates for quantum photonic

SUBMITTER: Sharma V 

PROVIDER: S-EPMC12627696 | biostudies-literature | 2025 Nov

REPOSITORIES: biostudies-literature