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Title: Electronic and Vibrational Properties of meso -Tetraphenylporphyrin on Silver Substrates

Abstract

The electronic and vibrational properties of meso-tetraphenylporphyrin (mtpp) on silver substrates are investigated using UV–vis and surface-enhanced resonance Raman scattering (SERRS) spectroscopy. Whereas the vibrational signatures associated with the tetrapyrrole backbone exhibit minor variations throughout sequences of consecutively recorded SERRS spectra, the C =C stretching vibrational modes localized on the meso-phenyl moieties of mtpp exhibit noticeable intensity fluctuations, masked in the average SERRS response. Finally, we attribute the observed vibrational-state-specific blinking events to conformational changes in mtpp, namely, torsional flexibility which mediates the coupling between the π-framework of the meso-phenyls and the underlying metal substrate.

Authors:
; ;
Publication Date:
Research Org.:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1168891
Report Number(s):
PNNL-SA-99895
Journal ID: ISSN 1089-5639; KC0301020
DOE Contract Number:  
AC05-76RL01830
Resource Type:
Journal Article
Journal Name:
Journal of Physical Chemistry. A, Molecules, Spectroscopy, Kinetics, Environment, and General Theory
Additional Journal Information:
Journal Volume: 118; Journal Issue: 37; Journal ID: ISSN 1089-5639
Publisher:
American Chemical Society
Country of Publication:
United States
Language:
English

Citation Formats

El-Khoury, Patrick Z., Honkala, Karoliina, and Hess, Wayne P. Electronic and Vibrational Properties of meso -Tetraphenylporphyrin on Silver Substrates. United States: N. p., 2014. Web. doi:10.1021/jp412360b.
El-Khoury, Patrick Z., Honkala, Karoliina, & Hess, Wayne P. Electronic and Vibrational Properties of meso -Tetraphenylporphyrin on Silver Substrates. United States. doi:10.1021/jp412360b.
El-Khoury, Patrick Z., Honkala, Karoliina, and Hess, Wayne P. Thu . "Electronic and Vibrational Properties of meso -Tetraphenylporphyrin on Silver Substrates". United States. doi:10.1021/jp412360b.
@article{osti_1168891,
title = {Electronic and Vibrational Properties of meso -Tetraphenylporphyrin on Silver Substrates},
author = {El-Khoury, Patrick Z. and Honkala, Karoliina and Hess, Wayne P.},
abstractNote = {The electronic and vibrational properties of meso-tetraphenylporphyrin (mtpp) on silver substrates are investigated using UV–vis and surface-enhanced resonance Raman scattering (SERRS) spectroscopy. Whereas the vibrational signatures associated with the tetrapyrrole backbone exhibit minor variations throughout sequences of consecutively recorded SERRS spectra, the C=C stretching vibrational modes localized on the meso-phenyl moieties of mtpp exhibit noticeable intensity fluctuations, masked in the average SERRS response. Finally, we attribute the observed vibrational-state-specific blinking events to conformational changes in mtpp, namely, torsional flexibility which mediates the coupling between the π-framework of the meso-phenyls and the underlying metal substrate.},
doi = {10.1021/jp412360b},
journal = {Journal of Physical Chemistry. A, Molecules, Spectroscopy, Kinetics, Environment, and General Theory},
issn = {1089-5639},
number = 37,
volume = 118,
place = {United States},
year = {2014},
month = {9}
}