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Optical Second Harmonic Generation Studies of Azobenzene Surfactant Adsorption and Photochemistry at the Water/1,2-Dichloroethane Interface
| Content Provider | Semantic Scholar |
|---|---|
| Author | Naujok, Roberta R. Paul, And Hillary J. Corn, Robert M. |
| Copyright Year | 1996 |
| Abstract | The surface-sensitive spectroscopic technique of optical second harmonic generation (SHG) is employed to study the adsorption and photochemistry of surfactant molecules at the water/1,2-dichloroethane (DCE) interface. Resonant SHG measurements at 730 nm are used to monitor the adsorption of the azobenzene surfactant 4-[[(dodecyloxy)benz-4-yl]azo]benzoic acid (DBA) from DCE solution to the interface at an aqueous pH of 8 or greater. The concentration and pH dependence of the resonant SHG from the adsorbed monolayer indicates that the DBA exists in its anionic (carboxylate) form at the interface. In a series of combined photochemical/SHG experiments the trans/cis photoisomerization of the adsorbed DBA anions is examined. SHG measurements demonstrate that illumination of the surface with light at 365 nm converts the adsorbed trans-DBA molecules to the cis isomer. The cis-DBA anion is found to be unusually stable at the liquid/liquid interface, and the entire photoactive monolayer (total area 4 cm2) can be ph... |
| Starting Page | 10497 |
| Ending Page | 10507 |
| Page Count | 11 |
| File Format | PDF HTM / HTML |
| DOI | 10.1021/jp960558m |
| Alternate Webpage(s) | http://corninfo.ps.uci.edu/reprints/RMC46.pdf |
| Alternate Webpage(s) | https://doi.org/10.1021/jp960558m |
| Volume Number | 100 |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
