Heavy atom effects on anthracene-rigid-rod excited states anchored to metal oxide nanoparticles

Jovan M. Giaimuccio, John G. Rowley, Gerald J. Meyer, Dong Wang, Elena Galoppini

Research output: Contribution to journalArticlepeer-review

17 Scopus citations

Abstract

Two new organic rigid-rod linker compounds, dimethyl 5-(1-anthracenylethynyl)isophthalate and dimethyl 5-(4-(1-anthracenynyl)phenylethynyl)-isophthalate, were used to couple anthracene to the surface of TiO2 (anatase) and ZrO2 nanoparticle thin films. These anthracene-rigid-rod molecules have high extinction coefficients and absorbance spectra that are red-shifted relative to 9-anthracenecarboxylic acid (9-AC). The rigid-rod linkers afford high surface coverages, ∼10-8 mol/cm2, on the nanostructured films in acetonitrile. Excimer-like emission on ZrO2 nanoparticles suggests that the rigid-rods do not spatially isolate the anthracene chromophores effectively. On TiO2 fluorescence was observed for both anthracene-rigid-rods while it was not detected for 9-AC consistent with quantitative electron injection into the semiconductor. Organoiodides and thallium cations (Tl+) were found to be heavy atom quenchers of the anthracene fluorescence in acetonitrile with a concentration dependence that followed the Stern-Volmer model. Fluorescence on ZrO2 was quenched less efficiently by the organoiodides while Tl+ cations exhibited enhanced quenching that followed the Stern-Volmer model at low Tl+ concentrations and saturated at higher concentrations, behavior attributed to surface adsorption.

Original languageEnglish (US)
Pages (from-to)146-153
Number of pages8
JournalChemical Physics
Volume339
Issue number1-3
DOIs
StatePublished - Oct 15 2007

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

Keywords

  • 9-Anthracenecarboxylic acid
  • Anthracene
  • Heavy atom quenching
  • Stern-Volmer
  • Thallium
  • Titanium dioxide
  • Zirconium dioxide

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