Characterizing the photoinduced switching process of a nitrospiropyran self-assembled monolayer using in situ sum frequency generation spectroscopy

Tamim A. Darwish, Yujin Tong, Michael James, Tracey L. Hanley, Qiling Peng, Shen Ye

Research output: Contribution to journalArticle

23 Citations (Scopus)

Abstract

Sum frequency generation (SFG) vibrational spectroscopy is employed to investigate the reversible, photoinduced spiro merocyanine isomerization of a self-assembled monolayer, the result of attachment of nitrospiropyran to a gold surface using a dithiolane anchoring group. The attachment of these molecular "alligator clips" to spiropyran molecules provide an easily accessible method to self-assemble a robust monolayer of spiropyran on a gold surface, which allows photoswitching of the spiropyran units. Probing the symmetric and antisymmetric stretching modes of the nitro group allows the determination of the structural orientation of the charged moiety with respect to the surface normal as well as the isomerization rates under photoinduced switching conditions. The photoisomerization of the spiropyran SAM on the gold surface is much faster than the rates of switching spiropyrans in a solid crystalline form, and the rate of thermal relaxation of the opened to closed form in this study is found to be on the same time scale as the relaxation of spiropyran when present in solutions with polar solvents.

Original languageEnglish
Pages (from-to)13852-13860
Number of pages9
JournalLangmuir
Volume28
Issue number39
DOIs
Publication statusPublished - 2012 Oct 2
Externally publishedYes

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Spectroscopy
  • Electrochemistry

Fingerprint Dive into the research topics of 'Characterizing the photoinduced switching process of a nitrospiropyran self-assembled monolayer using in situ sum frequency generation spectroscopy'. Together they form a unique fingerprint.

  • Cite this