Bright NIR-Emitting Styryl Pyridinium Dyes with Large Stokes' Shift for Sensing Applications.

ABSTRACT: Two NIR-emitting donor-π-acceptor (D-π-A) type regioisomeric styryl pyridinium dyes (1a-1b) were synthesized and studied for their photophysical performance and environment sensitivity. The two regioisomers, 1a and 1b, exhibited interesting photophysical properties including, longer wavelength excitation (λ_ex ≈ 530-560 nm), bright near-infrared emission (λ_em ≈ 690-720 nm), high-fluorescence quantum yields (ϕ_fl ≈ 0.24-0.72) large Stokes' shift (∆λ ≈ 150-240 nm) and high-environmental sensitivity. Probe's photophysical properties were studied in different environmental conditions such as polarity, viscosity, temperature, and concentration. Probes (1a-1b) exhibited noticeable changes in absorbance, emission and Stokes'

SUBMITTER: Wickramasinghe NI 

PROVIDER: S-EPMC10452306 | biostudies-literature | 2023 Aug

REPOSITORIES: biostudies-literature