Revisit of the plasmon-mediated chemical transformation of para -aminothiophenol.
Toshiki KondoMotoharu InagakiShohei TanakaShinya TsukijiKenta MotobayashiKatsuyoshi IkedaPublished in: Physical chemistry chemical physics : PCCP (2023)
Fingerprint Raman features of para -aminothiophenol (pATP) in surface-enhanced Raman scattering (SERS) spectra have been widely used to measure plasmon-driven catalytic activities because the appearance of characteristic spectral features is purported to be due to plasmon-induced chemical transformation of pATP to trans-p , p '-dimercaptoazobenzene ( trans -DMAB). Here, we present a thorough comparison of SERS spectra for pATP and trans -DMAB in the extended range of frequencies covering group vibrations, skeletal vibrations, and external vibrations under various conditions. Although the fingerprint vibration modes of pATP could be almost mistaken with those of trans -DMAB, the low-frequency vibrations revealed distinct differences between pATP and DMAB. Photo-induced spectral changes of pATP in the fingerprint region were explained well by photo-thermal variation of the Au-S bond configuration, which affects the degree of the metal-to-molecule charge transfer resonance. This finding indicates that a large number of reports in the field of plasmon-mediated photochemistry must be reconsidered.
Keyphrases
- energy transfer
- sensitive detection
- high glucose
- gold nanoparticles
- diabetic rats
- optical coherence tomography
- raman spectroscopy
- magnetic resonance imaging
- drug induced
- density functional theory
- quality control
- label free
- oxidative stress
- emergency department
- electron transfer
- endothelial cells
- single cell
- computed tomography
- reduced graphene oxide
- molecular dynamics
- visible light
- adverse drug