Abstract
Abstract Photophysical and photochemical properties of 1-methyl-1,2-diphenylbenzo[b]phospholium iodide (diPh-I) and 1-methyl-1,2,3-triphenylbenzo[b]phospholium iodide (triPh-I) were investigated by obtaining time-resolved fluorescence and the transient absorption spectra with sub-picosecond time-resolution. Unusually, fluorescence lifetimes of the triphenyl-substituted compound in various solvents were approximately 100 ps, which is several times shorter than the lifetime of diPh-I. Quantum chemical calculations suggest that the excited-state planarization of the dihedral angle between the benzo[b]phospholium backbone and the phenyl group at Cα possibly contributes to the non-radiative relaxation of triPh-I. In the case of diPh-I, the fluorescence excitation spectrum obtained in dichloromethane depended on the concentration, suggesting that diPh-I forms molecular aggregates in the ground state. The transient absorption spectra of diPh-I showed that, at various concentrations of dichloromethane, the dissociation dynamics of aggregation to produce the monomeric form in the excited state occurred over several picoseconds.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
