We are investigating how the excited-state dynamics of organic molecules change when going from solution phase to liquid/liquid interfaces. This is illustrated here with an azobenzene derivative that undergoes ultrafast trans-to-cis photoisomerisation. This process can be seen by transient electronic absorption as an incomplete recovery of the trans ground-state population (negative band at ~475 nm). A similar behaviour but with a smaller recovery can be seen at the dodecane/water interface, pointing to differences in the photoisomerisation efficiency when going from bulk water to the interface.
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Physical Chemistry Department - Sciences II - University of Geneva
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