Photoreduction of 4,4'-dimercaptoazobenzene on ag revealed by Raman scattering spectroscopy
The surface-enhanced Raman scattering (SERS) of 4,4'-dimercaptoazobenzene (4,4'-DMAB) has recently seen a surge of interest, since it might be possible to form 4,4'-DMAB from 4-aminobenzenethiol (4-ABT) via a surface-induced photoreaction. We found in this study, however, that the rev...
| Veröffentlicht in: | Langmuir : the ACS journal of surfaces and colloids. - 1985. - 29(2013), 1 vom: 08. Jan., Seite 183-90 |
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| Weitere Verfasser: | , |
| Format: | Online-Aufsatz |
| Sprache: | English |
| Veröffentlicht: |
2013
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| Zugriff auf das übergeordnete Werk: | Langmuir : the ACS journal of surfaces and colloids |
| Schlagworte: | Journal Article |
| Zusammenfassung: | The surface-enhanced Raman scattering (SERS) of 4,4'-dimercaptoazobenzene (4,4'-DMAB) has recently seen a surge of interest, since it might be possible to form 4,4'-DMAB from 4-aminobenzenethiol (4-ABT) via a surface-induced photoreaction. We found in this study, however, that the reverse conversion of 4,4'-DMAB to 4-ABT on Ag is a more feasible process upon irradiation with a 514.5 nm (not 632.8 nm) laser under ambient conditions. First of all, the SERS spectral pattern of 4,4'-DMAB on Ag varied as a function of laser irradiation time, finally becoming the same as that of 4-ABT on Ag. Second, the coupling reaction with 4-cyanobenzoic acid to form amide bonds proceeded readily like 4-ABT once 4,4'-DMAB on Ag was exposed to 514.5 nm radiation. Third, the growth of a calcite crystal occurred on 4,4'-DMAB on Ag, also likely on 4-ABT, when it was exposed to 514.5 nm radiation beforehand. All of these results led us to conclude that the appearance of the so-called b(2)-type bands in the SERS of 4-ABT must be due to the involvement of the chemical enhancement mechanism, not due to the formation of 4,4'-DMAB |
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| Beschreibung: | Date Completed 14.06.2013 Date Revised 08.01.2013 published: Print-Electronic Citation Status PubMed-not-MEDLINE |
| ISSN: | 1520-5827 |
| DOI: | 10.1021/la304159c |