Abstract
The photophysics and electronic spectroscopy of 9,10-bis(phenylethynyl)anthracene (BPEA) were studied using absorption spectroscopy with polarized light, fluorescence anisotropy, and simple semiempirical calculations. The UV−vis spectrum of BPEA in fluid media shows a diminished vibrational resolution as compared to the fluorescence spectrum, whereas this resolution is recovered when a polyethylene film is used as the solvent. By comparison with the results of the semiempirical calculations, we conclude that the behavior in fluid media is a result of the coexistence of several conformations. In contrast, only the planar conformation exists in the polymer, giving a well-resolved spectrum. Dichroic UV−vis spectra show that the lowest energy transition is polarized along the long axis of the molecule (short axis of the anthracene frame) and shows the existence of an overlapping blue-shifted band with perpendicular polarization, which has null oscillator strength in pristine anthracene. The spectral overlap i...
Sign-in/Register to access full text options 
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.
