Thia[n]helicenes with long persistent phosphorescence.

ABSTRACT: Helicenes with persistent luminescence have received relatively little attention, despite their demonstrated highly efficient intersystem crossing (ISC) from the excited singlet to the triplet state. Herein, we designed a series of ortho-fused aromatics by combining dithieno[2,3-b:3',2'-d]thiophene (DTT) with annulated benzene fragments, denoted as TB[n]H (n = 3-8), to achieve persistent luminescence. Wherein, thia[n]helicenes (n = 5-8) exhibited intense phosphorescence with millisecond-range lifetimes (τ_p) at 77 K. Particularly interesting was the observation that the odd-numbered ring helicenes displayed longer τ_p values than their neighboring even-numbered counterparts. Notably, TB[7]H showcased the lon

SUBMITTER: Sun Z 

PROVIDER: S-EPMC10793212 | biostudies-literature | 2024 Jan

REPOSITORIES: biostudies-literature