Hydrogen-Bond-Assisted Excited-State Deactivation at Liquid/Water Interfaces
- 15 March 2011
- journal article
- research article
- Published by American Chemical Society (ACS) in Langmuir
- Vol. 27 (8), 4645-4652
- https://doi.org/10.1021/la104801h
Abstract
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.This publication has 52 references indexed in Scilit:
- Femtosecond time-resolved electronic sum-frequency generation spectroscopy: A new method to investigate ultrafast dynamics at liquid interfacesThe Journal of Chemical Physics, 2008
- Static and Dynamic Electronic Spectroscopy at Liquid InterfacesChemical Reviews, 2006
- Interfacial NanochemistryPublished by Springer Science and Business Media LLC ,2005
- Molecular Bonding and Interactions at Aqueous Surfaces as Probed by Vibrational Sum Frequency SpectroscopyChemical Reviews, 2002
- Liquid Interfaces In Chemical, Biological And Pharmaceutical ApplicationsPublished by Taylor & Francis Ltd ,2001
- Orientational Phase Transitions in Merocyanine Monolayers on Acidic Aqueous SubphasesLangmuir, 2000
- Compression of the dye monolayer at the air/water interface studied by second harmonic generationChemical Physics, 1999
- Optical Surface Second Harmonic Generation Study of the Two Acid/Base Equilibria of Eosin B at the Air/Water InterfaceLangmuir, 1997
- Ultrafast dynamics and structure at aqueous interfaces by second harmonic generationChemical Physics, 1996
- Liquid Interfaces Probed by Second-Harmonic and Sum-Frequency SpectroscopyChemical Reviews, 1996