Excited-state intramolecular charge transfer dynamics in 4-methoxy-4'-nitrostilbene: excitation wavelength and solvent dependence.

ABSTRACT: We present a detailed study of the excited-state dynamics of 4-methoxy-4'-nitrostilbene (MNS), a donor-acceptor chromophore, focusing on the effects of solvent polarity, viscosity, and excitation energy. Steady-state spectroscopy reveals strong intramolecular charge transfer (ICT) behavior, with solvatochromic shifts and large Stokes shifts in polar solvents. Time-resolved fluorescence measurements show that both polarity and viscosity enhance ICT state stabilization by extending emissive state lifetimes. Femtosecond transient absorption measurements in toluene and acetonitrile reveal distinct spectral features and relaxation dynamics upon excitation at different wavelengths. In the case of toluene, 370 and 310 nm excitations lead to efficient intersystem crossing (ISC) as depicted by a st

SUBMITTER: Mitra PK 

PROVIDER: S-EPMC12857537 | biostudies-literature | 2026 Jan

REPOSITORIES: biostudies-literature