Journal
JOURNAL OF RAMAN SPECTROSCOPY
Volume 37, Issue 1-3, Pages 132-141Publisher
WILEY
DOI: 10.1002/jrs.1467
Keywords
hyper-Raman; resonance Raman; surface-enhanced Raman; donor-acceptor; stilbene
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Surface-enhanced Raman spectra (SERS) are presented for two water-soluble, donor-donor- or donor- acceptor-substituted phenylene vinylene derivatives adsorbed on the surfaces of colloidal silver nanoparticles. The normally water-insoluble, substituted stilbene and distyrylbenzene chromophores have been modified by attaching trimethylammoniumalkyl chains to the amino donor group, creating both aqueous solubility and a net positive charge that facilitates binding to citrate- or borohydride-reduced silver colloids. A symmetrically donor-substituted distyrylbenzene exhibits strong electronically pre-resonant SERS spectra that are not highly dependent on excitation wavelength and are qualitatively similar to the solution-phase resonance Raman (RR) spectra. A donor- acceptor-substituted stilbene exhibits weaker SERS enhancement despite being fully electronically resonant. The spectra vary considerably with excitation wavelength and show new lines not present in the solution-phase spectra, which are attributed to a photoproduct formed on the surface. Two-photon resonant hyper-Raman spectra are also presented for the donor-acceptor stilbene, both with and without surface enhancement. Copyright (C) 2006 John Wiley & Sons, Ltd.
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