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Electronic and Vibrational Properties of Meso-Tetraphenylporphyrin on Silver Substrates

Patrick Z El-Khoury, Karoliina Honkala, Wayne P Hess

J Phys Chem A. 2014 Sep 18;118(37):8115-23.

PMID: 24555543

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. 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.

Chemicals Related in the Paper:

Catalog Number Product Name Structure CAS Number Price
AP917237-A meso-Tetraphenylporphyrin meso-Tetraphenylporphyrin 917-23-7 Price
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