Ultrafast photoisomerization and its single-shot pump pulse efficiency of trans-azobenzene derivative: Compound for photosensitive DNA |
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| Authors: | Tao Chen Atsushi Yamaguchi Kazumasa Igarashi Naoya Nakagawa Hidenori Nishioka Hiroyuki Asanuma Mikio Yamashita |
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| Institution: | 1. Department of Applied Physics, Graduate School of Engineering, Hokkaido University and Core Research for Evolutional Science and Technology (CREST), Japan Science and Technology Agency (JST), Kita-13, Nishi-8, Kita-ku, Sapporo 060-8628, Japan;2. Department of Molecular Design and Engineering, Graduate School of Engineering, Nagoya University and Core Research for Evolutional Science and Technology (CREST), Japan Science and Technology Agency (JST), Nagoya 464-8603, Japan;3. School of Electronic & Information Engineering, Xi''an Jiaotong University, Xi''an, 710049, China;1. School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, PR China;2. Department of Materials Science and Engineering, College of Engineering, Peking University, Beijing 100871, PR China;1. School of Optoelectronic Science and Engineering, Soochow University, Suzhou 215006, China;2. Jiangsu Key Laboratory of Micro and Nano Heat Fluid Flow Technology and Energy Application, School of Mathematics and Physics, Suzhou University of Science and Technology, Suzhou 215009, China;3. Department of Physics, Soochow University, Suzhou 215123, China;4. Department of Physics, Harbin Institute of Technology, Harbin 150001, China;1. Department of Chemistry, Xinzhou Teacher'' s University, Xinzhou 034000, China;2. College of Physics & Electronic Engineering and Jiangsu Laboratory of Advanced Functional Materials, Changshu Institute of Technology, Changshu 215500, China;3. College of Physics, Optoelectronics and Energy, Soochow University, Suzhou 215123, China;1. Institute of Physics, Faculty of Physics, Astronomy and Informatics, Nicolaus Copernicus University, Grudziadzka 5, 87-100 Torun, Poland;2. Department of Physics, Faculty of Sciences, Selcuk University Campus, Konya, Turkey;3. LUNAM Université, Université d''Angers, CNRS UMR 6200, Laboratoire MOLTECH-Anjou, 2 bd Lavoisier, 49045 Angers Cedex, France;1. College of Chemistry and Molecular Engineering, Zhengzhou University, Henan, 450001, China;2. Zhengzhou Food and Drug Inspection Institute, Henan, 450001, China;3. Department of Applied Physics, Harbin Institute of Technology, Heilongjiang, 150001, China |
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| Abstract: | The femtosecond photoisomerization processes of trans (T) 4-carboxy-2′,6′-dimethylazobenzen, which has been employed recently as an efficient photoregulator of DNA hybridization, were clarified by the rate equation analysis of measured transient absorbance changes with (350 nm) and without (380 nm) ground-state absorption of both the reactant (T) and photoproduct (cis: C) isomers under S2T-band excitation (360 nm, 150 fs pump): after excitation to the S2T state with a 450-fs lifetime, ~ 1.5% of the T-molecules in the S2T state are isomerized to the C-form within ~ 6 ps through the intermediate state (so called bottleneck state), but most of those return back to the T ground-state S2T via the internal conversion processes with an ultrafast kinetic rate of 2.2 × 1012 s? 1. Moreover, the rate equation analysis enables us to determine the T-to-C photoisomerization rate ηT,C per pump pulse to be 0.0011 at the pump energy of 80 nJ from the amplitude A3,350 of the offset component in the 350-nm probe signal, and to obtain the photoisomerization quantum yield ΦT,C = 0.094. The latter value is slightly lower than that of T-azobenzene, and well agrees with that (ΦT,C = 0.097) measured by the conventional CW irradiation method using a photostationary state. |
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