Metal-free pyridinium salts with strong room-temperature phosphorescence and microsecond radiative lifetime.

ABSTRACT: Easily processed metal-free phosphorescent luminophores with a fast rate of phosphorescence are emerging as promising materials for advanced optoelectronics. Alkylation of a modified vitamin B6 vitamer (pyridoxine) affords a family of pyridinium-derived ionic pairs 1-7 exhibiting variable anion-π interactions in the solid state. Such a noncovalent cation-anion network promotes tunable room-temperature phosphorescence (RTP, λ _em = 510-565 nm) in crystalline materials stemming from anion(I^-)-π(pyridinium⁺) charge transfer. Systematic X-ray structural and computational studies manifest the key role of the anion(I^-)-π(pyridinium⁺) distance in the spin-orbit coupling, hence the observed RTP. For the studied pyridinium salts with RTP,

SUBMITTER: Hakkarainen E 

PROVIDER: S-EPMC12394909 | biostudies-literature | 2025 Aug

REPOSITORIES: biostudies-literature