Loading...
Please wait, while we are loading the content...
Similar Documents
Ultrafast investigation of excited-state dynamics in trans-4-methoxyazobenzene studied by femtosecond transient absorption spectroscopy
| Content Provider | Semantic Scholar |
|---|---|
| Author | Wang, Ya-Ping Li, Chun-Hua Zhang, Bing Xin Qin, Chen Zhang, Song Li |
| Copyright Year | 2018 |
| Abstract | The ultrafast photoisomerization and excited-state dynamics of trans-4-methoxyazobenzene (trans-4-MAB) in solutions were investigated by femtosecond transient absorption spectroscopy and quantum chemistry calculations. After being excited to the S2 state, the two-dimensional transient absorptions spectra show that cis-4-MAB is produced and witnessed by the permanent positive absorption in 400–480 nm. Three decay components are determined to be 0.11, 1.4 and 2.9 ps in ethanol, and 0.16, 1.5 and 7.5 ps in ethylene glycol, respectively. The fast component is assigned to the internal conversion from the S2 to S1 state. The other relaxation pathways are correlated with the decay of the S1 state via internal conversion and isomerization, and the vibrational cooling of the hot S0 state of the cis-isomer. Comparing of the dynamics in different solvents, it is demonstrated that the photoisomerization pathway undergoes the inversion mechanism rather than the rotation mechanism.The ultrafast photoisomerization and excited-state dynamics of trans-4-methoxyazobenzene (trans-4-MAB) in solutions were investigated by femtosecond transient absorption spectroscopy and quantum chemistry calculations. After being excited to the S2 state, the two-dimensional transient absorptions spectra show that cis-4-MAB is produced and witnessed by the permanent positive absorption in 400–480 nm. Three decay components are determined to be 0.11, 1.4 and 2.9 ps in ethanol, and 0.16, 1.5 and 7.5 ps in ethylene glycol, respectively. The fast component is assigned to the internal conversion from the S2 to S1 state. The other relaxation pathways are correlated with the decay of the S1 state via internal conversion and isomerization, and the vibrational cooling of the hot S0 state of the cis-isomer. Comparing of the dynamics in different solvents, it is demonstrated that the photoisomerization pathway undergoes the inversion mechanism rather than the rotation mechanism. |
| Starting Page | 749 |
| Ending Page | 755 |
| Page Count | 7 |
| File Format | PDF HTM / HTML |
| DOI | 10.1063/1674-0068/31/cjcp1806155 |
| Volume Number | 31 |
| Alternate Webpage(s) | http://cjcp.ustc.edu.cn/hxwlxb_cn/ch/reader/create_pdf.aspx?file_no=CJCP1806155&flag=1&quarter_id=6&year_id=2018 |
| Alternate Webpage(s) | https://doi.org/10.1063/1674-0068%2F31%2Fcjcp1806155 |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
