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Unraveling a self-assembling mechanism of isomeric aminothiophenol on Ag dendrite by correlated SERS and matrix-free LDI-MS

  • Yankai Ma
  • Bei NieEmail author
Research Paper

Abstract

Correlated spectroscopic analysis can provide complementary chemical insights that are often unattainable by either approach used in isolation. We distinguished the different self-assembling behavior of isomeric aminothiophenols (ATPs) on Ag dendrite by the correlation of surface-enhanced Raman spectroscopy and laser-induced desorption ionization mass spectrometry, demonstrating that steric effect impinged significantly upon surface molecular density and plasmon-driven catalytic reaction yield, which led to drastic variations in the resulting SERS spectra. The correlative measurement shows that ortho-substitute barely formed a self-assemble monolayer, relative to the para-isomer, which can form a close-packed self-assembled monolayer and perform a decent azo-coupling reaction. Comparison between normal and SERS spectra of ATP isomers supports the fact that additional disulfide- or hydrogen-bonding interactions are established in para-ATP solid crystal, but neither of ortho- nor meta-isomers. This work is expected to create a significant impact on the development of an orthogonally correlated spectroscopic tool in deciphering chemical insights and underlying reaction mechanism.

Graphical abstract

Keywords

Correlative spectroscopy Self-assembling monolayer Aminothiophenol Surface-enhanced Raman scattering Laser-induced desorption ionization mass spectrometry 

Abbreviations

ATP

Aminothiophenol

SAM

Self-assembling monolayer

SERS

Surface-enhanced Raman spectroscopy

MALDI-TOF

Matrix-assisted laser desorption ionization-time of flight

LDI-MS

Laser-induced desorption ionization mass spectrometry

CRM

Confocal Raman microscopy

SIMS

Second ion mass spectrometer

DMAB

Dimercaptoazobenzene

NRS

Normal Raman spectrum

TNI

Transient negative ion

Notes

Funding information

This work was supported by South-central University of Nationalities Start-up funds under Grant YZZ16004 and China Central University Administration under Grant CZZ18002.

Compliance with ethical standards

Conflict of interest

The authors declare that they have no conflict of interest.

Supplementary material

216_2019_2187_MOESM1_ESM.pdf (303 kb)
ESM 1 (PDF 302 kb)

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  1. 1.Department of Chemistry and Material ScienceSouth Central University of NationalitiesWuhanChina
  2. 2.Chongqing Institute of Green and Intelligent TechnologyChinese Academy of SciencesChongqingChina

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