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Solvent dependent photo-isomerization of 4-dimethylaminoazobenzene carboxylic acid
- Authors
- Lee, Yu Jin; Yang, Sung Ik; Kang, Dae Seung; Joo, Sang-Woo
- Issue Date
- 15-Jul-2009
- Publisher
- ELSEVIER SCIENCE BV
- Keywords
- Azobenzene; Cis-trans isomerization; Reversibility; Solvent effect; Activation energy; Temperature-dependent UV-Vis absorption spectroscopy
- Citation
- CHEMICAL PHYSICS, v.361, no.3, pp.176 - 179
- Journal Title
- CHEMICAL PHYSICS
- Volume
- 361
- Number
- 3
- Start Page
- 176
- End Page
- 179
- ISSN
- 0301-0104
- Abstract
- We have observed reversible trans-cis photo-isomerization behaviors of 4-dimethylaminoazobenzene carboxylic acid (4DAzC) in ethyl acetate by alternating irradiations at 370 and 430 nm. The photo-isomerization from trans- to cis-isomer was found to be strongly solvent dependent and not to occur efficiently in water and ethanol. Also photo-isomerization from cis- to trans-isomer was occurred upon 370 nm illumination or via thermal relaxation. The activation energy for the thermal isomerization from cis to trans-isomer was estimated to be 49.2 kJ/mol in ethyl acetate from the temperature-dependent kinetic absorption measurements. (C) 2009 Elsevier B.V. All rights reserved.
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Related Researcher
- Joo, Sang Woo
- College of Natural Sciences (Department of Chemistry)