Abstract
The photoisomerization dynamics of 4-(dimethylamino)azobenzene (DMAAB) are studied using subpicosecond pump–probe spectroscopy. Following photoexcitation at 400 nm, resonant with the lowest-lying π–π * transition, excited-state internal conversion occurs with a time-constant of ∼0.8 ps in acetone and ethanol, and ∼1.4 ps in fluorotrichloromethane. Internal conversion is followed by ground-state vibrational relaxation on the ∼10 ps timescale. It is proposed that the solvent dependence of the excited-state decay reflects the solvent-polarity dependence of the excited-to-ground-state energy gap. The results presented here, in combination with earlier work, suggest that rapid isomerization following photoexcitation into the lowest-energy electronic state is a general feature of azobenzene photochemistry.
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.
