Journal
JOURNAL OF CHEMICAL PHYSICS
Volume 131, Issue 19, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.3263918
Keywords
ab initio calculations; excited states; isomerisation; molecular dynamics method; photochemistry; SCF calculations
Funding
- Ministry of Education, Science and Culture
- Japan Society for the Promotion of Science for Research Fellowships for Young Scientist
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Photoisomerization mechanism of azobenzene in the lowest excited state S-1(n pi(*)) is investigated by ab initio molecular dynamics (AIMD) simulation with the RATTLE algorithm, based on the state-averaged complete active space self-consistent field method. AIMD simulations show that cis to trans isomerization occurs via two-step rotation mechanism, accompanying rotations of the central NN part and two phenyl rings, and this process can be classified into two types, namely, clockwise and counterclockwise rotation pathways. On the other hand, trans to cis isomerization occurs via conventional rotation pathway where two phenyl rings rotate around the NN bond. The quantum yields are calculated to be 0.45 and 0.28 +/- 0.14 for cis to trans and trans to cis photoisomerizations, respectively, which are in very good agreement with the corresponding experimental results.
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