Intramolecular Singlet Fission in Individual Graphene Nanoribbons─Competition with a Charge Transfer.

ABSTRACT: Graphene nanoribbons (NRs) constitute a versatile platform for developing novel materials, where their structure governs their optical, electronic, and magnetic properties while also shaping their excited-state dynamics. Here, we investigate a set of three twisted N-doped molecular NRs of increasing length, obtained by linearly fusing perylene diimide to pyrene and pyrazino- or thiadiazolo-quinoxaline residues. By employing various temperature-dependent time-resolved spectroscopy techniques, we reveal how the flexible twisted NR geometry promotes the formation of a mixed electronic state with varying contributions from locally excited and charge-transfer (CT) states. The fate of this mixed state is highly sensitive to the molecular geometry, length, and solvent polarity. For the shortest N

SUBMITTER: Greißel PM 

PROVIDER: S-EPMC12272549 | biostudies-literature | 2025 Apr

REPOSITORIES: biostudies-literature