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.
| Original language | English |
|---|---|
| Pages (from-to) | 176-179 |
| Number of pages | 4 |
| Journal | Chemical Physics |
| Volume | 361 |
| Issue number | 3 |
| DOIs | |
| Publication status | Published - 15 Jul 2009 |
Keywords
- Activation energy
- Azobenzene
- Cis-trans isomerization
- Reversibility
- Solvent effect
- Temperature-dependent UV-Vis absorption spectroscopy
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