<P>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...
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https://www.riss.kr/link?id=A107673016
2013
-
SCOPUS,SCIE
학술저널
183-190(8쪽)
0
상세조회0
다운로드다국어 초록 (Multilingual Abstract)
<P>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...
<P>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<SUB>2</SUB>-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.</P><P><B>Graphic Abstract</B>
<IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/langd5/2013/langd5.2013.29.issue-1/la304159c/production/images/medium/la-2012-04159c_0001.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/la304159c'>ACS Electronic Supporting Info</A></P>
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