Surface-Enhanced Raman Scattering and Surface-Enhanced Resonance Raman Scattering Excitation Profiles of Ag-2,2‘-Bipyridine Surface Complexes and of [Ru(bpy)3]2+on Ag Colloidal Surfaces: Manifestations of the Charge-Transfer Resonance Contributions to the Overall Surface Enhancement of Raman Scattering#

2000 ◽  
Vol 39 (16) ◽  
pp. 3551-3559 ◽  
Author(s):  
Ivana Srnová-Šloufová ◽  
Blanka Vlčková ◽  
Theo L. Snoeck ◽  
Derk J. Stufkens ◽  
Pavel Matějka
Keyword(s):  
Charge Transfer ◽  
Raman Scattering ◽  
Resonance Raman ◽  
Surface Enhanced Raman Scattering ◽  
Resonance Raman Scattering ◽  
Surface Complexes ◽  
Surface Enhancement ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Enhanced Raman Scattering

scholarly journals Intramolecular and Metal-to-Molecule Charge Transfer Electronic Resonances in the Surface-Enhanced Raman Scattering of 1,4-Bis((E)-2-(pyridin-4-yl)vinyl)naphthalene

Molecules ◽  
2019 ◽  
Vol 24 (24) ◽  
pp. 4622 ◽  
Author(s):  
Isabel López-Tocón ◽  
Elizabeth Imbarack ◽  
Juan Soto ◽  
Santiago Sanchez-Cortes ◽  
Patricio Leyton ◽  
...  
Keyword(s):  
Charge Transfer ◽  
Raman Scattering ◽  
Resonance Raman ◽  
Surface Enhanced Raman Scattering ◽  
Complex Model ◽  
Electrode Potentials ◽  
General Chemical ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Enhanced Raman Scattering

Electrochemical surface-enhanced Raman scattering (SERS) of the cruciform system 1,4-bis((E)-2-(pyridin-4-yl)vinyl)naphthalene (bpyvn) was recorded on nanostructured silver surfaces at different electrode potentials by using excitation laser lines of 785 and 514.5 nm. SERS relative intensities were analyzed on the basis of the resonance Raman vibronic theory with the help of DFT calculations. The comparison between the experimental and the computed resonance Raman spectra calculated for the first five electronic states of the Ag2-bpyvn surface complex model points out that the selective enhancement of the SERS band recorded at about 1600 cm−1, under 785 nm excitation, is due to a resonant Raman process involving a photoexcited metal-to-molecule charge transfer state of the complex, while the enhancement of the 1570 cm−1 band using 514.5 nm excitation is due to an intramolecular π→π* electronic transition localized in the naphthalenyl framework, resulting in a case of surface-enhanced resonance Raman spectrum (SERRS). Thus, the enhancement of the SERS bands of bpyvn is controlled by a general chemical enhancement mechanism in which different resonance processes of the overall electronic structure of the metal-molecule system are involved.

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