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Single molecule Raman spectra of porphycene isotopologues
- Source :
- Nanoscale. 8:3337-3349
- Publication Year :
- 2016
- Publisher :
- Royal Society of Chemistry (RSC), 2016.
-
Abstract
- Single molecule surface-enhanced resonance Raman scattering (SERRS) spectra have been obtained for the parent porphycene (Pc-d0) and its deuterated isotopologue (Pc-d12), located on gold and silver nanoparticles. Equal populations of "hot spots" by the two isotopologues are observed for 1 : 1 mixtures in a higher concentration range of the single molecule regime (5 × 10(-9) M). For decreasing concentrations, hot spots are preferentially populated by undeuterated molecules. This is interpreted as an indication of a lower surface diffusion coefficient of Pc-d12. The photostability of single Pc molecules placed on nanoparticles is strongly increased in comparison with polymer environments. Trans tautomeric species dominate the spectra, but the analysis of time traces reveals transient intermediates, possibly due to rare cis tautomeric forms.
- Subjects :
- Surface diffusion
Chemistry
Analytical chemistry
02 engineering and technology
010402 general chemistry
021001 nanoscience & nanotechnology
Photochemistry
Resonance (chemistry)
01 natural sciences
Tautomer
Spectral line
0104 chemical sciences
symbols.namesake
symbols
Molecule
General Materials Science
Isotopologue
0210 nano-technology
Raman spectroscopy
Raman scattering
Subjects
Details
- ISSN :
- 20403372 and 20403364
- Volume :
- 8
- Database :
- OpenAIRE
- Journal :
- Nanoscale
- Accession number :
- edsair.doi.dedup.....6dbf252d735c4c93ed7fc20c422b3c6a