Abstract
The time-resolved transient absorption and gain of 3-hydroxyflavone in ethanol ( T = 300 and 173 K) and MCH ( T = 300 and 198 K) has been investigated. Two absorption bands (A and B) and two gain bands (E 1 and E 2) have been observed. Band A (lying in the 5200 Å spectral region) appears during and just after the excitation step and is assigned to the normal excited form N ★ x Band B (lying in the 6050 Å spectral region) appears after band A and is assigned to the tautomer form T ★. A gain band E 2 (lying at λ=5400 Å) appears at the same time as the B band and is attributed to the T ★→T emission. A gain band E 1 (lying at λ = 5730 Å) appears earlier than the E 2 band. Its origin is discussed and two possible assignments are presented: vibronic progression of the emission spectrum of T ★ or formation of an intermediate species on the proton transfer pathway from N ★ x to T ★.
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.
