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RESEARCH PRODUCT
Electronic and vibrational properties of meso-tetraphenylporphyrin on silver substrates.
Karoliina HonkalaWayne P. HessPatrick Z. El-khourysubject
Resonance (chemistry)PhotochemistryTetrapyrroleSpectral linechemistry.chemical_compoundsymbols.namesakechemistryMolecular vibrationTetraphenylporphyrinPhysics::Atomic and Molecular ClusterssymbolsMetal substratePhysical and Theoretical ChemistrySpectroscopyta116Raman scatteringdescription
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.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2014-03-12 | The journal of physical chemistry. A |