Scientific article
Open access

Hydrogen-Bond-Assisted Excited-State Deactivation at Liquid/Water Interfaces

Published inLangmuir, vol. 27, no. 8, p. 4645-4652
Publication date2011

The excited-state dynamics of eosin B (EB) at dodecane/water and decanol/water interfaces has been investigated with polarization-dependent and time-resolved surface second harmonic generation. The results of the polarization-dependent measurements vary substantially with (1) the EB concentration, (2) the age of the sample, and (3) the nature of the organic phase. All of these effects are ascribed to the formation of EB aggregates at the interface. Aggregation also manifests itself in the time-resolved measurements as a substantial shortening of the excited-state lifetime of EB. However, independently of the dye concentration used, the excited-state lifetime of EB at both dodecane/water and decanol/water interfaces is much longer than in bulk water, where the excited-state population undergoes hydrogen-bond-assisted non-radiative deactivation in a few picoseconds. These results indicate that hydrogen bonding between EB and water molecules at liquid/water interfaces is either much less efficient than in bulk water or does not enhance non-radiative deactivation. This strong increase of the excited-state lifetime of EB at liquid/water interfaces opens promising avenues of applying this molecule as a fluorescent interfacial probe.

Citation (ISO format)
FITA, Piotr, FEDOSEEVA, Marina, VAUTHEY, Eric. Hydrogen-Bond-Assisted Excited-State Deactivation at Liquid/Water Interfaces. In: Langmuir, 2011, vol. 27, n° 8, p. 4645–4652. doi: 10.1021/la104801h
Main files (1)
Article (Published version)
ISSN of the journal1520-5827

Technical informations

Creation05/10/2011 10:30:00 AM
First validation05/10/2011 10:30:00 AM
Update time03/14/2023 4:51:27 PM
Status update03/14/2023 4:51:27 PM
Last indexation05/02/2024 11:56:48 AM
All rights reserved by Archive ouverte UNIGE and the University of GenevaunigeBlack