Surface-enhanced Raman scattering and surface-enhanced infrared absorptionspectroscopic studies of a metalloporphyrin monolayer film formed on pyridine self-assembled monolayer-modified gold

Citation
Zj. Zhang et al., Surface-enhanced Raman scattering and surface-enhanced infrared absorptionspectroscopic studies of a metalloporphyrin monolayer film formed on pyridine self-assembled monolayer-modified gold, LANGMUIR, 17(15), 2001, pp. 4564-4568
Citations number
33
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Physical Chemistry/Chemical Physics
Journal title
LANGMUIR
ISSN journal
0743-7463 → ACNP
Volume
17
Issue
15
Year of publication
2001
Pages
4564 - 4568
Database
ISI
SICI code
0743-7463(20010724)17:15<4564:SRSASI>2.0.ZU;2-#
Abstract
A self-assembled monolayer film (SAM) of 2,3,7,8,12,13,17, 18-octaethylporp hinatozinc formed on a gold surface premodified with a SAM of 4-pyridinethi ol was studied by means of surface-enhanced Raman scattering (SERS), surfac e-enhanced infrared absorption (SEIRA), and ultraviolet-visible (UV-vis) sp ectroscopies. The SERS spectrum of the porphyrin monolayer on the pyridine- modified Au surface shows bands only from the underlying pyridine group. Th e frequency shift and change in the relative intensity of the bands due to the pyridine group in the SERS spectra imply indirectly the binding of the metalloporphyrin to the pyridine group in the SAM. This is further supporte d by the SEIRA spectra of the porphyrin-pyridine SAM, in which vibrational bands arising from both the porphyrin moiety and the pyridyl group appear c learly. In addition, the UV-vis spectra also suggest the formation of the p orphyrin-pyridine SAM and the weak porphyrin-porphyrin interactions in the SARI.