Structural parameters of Zn(II) complexes of 8-hydroxyquinoline-based tripodal ligands affect fluorescence quantum yield

Maksim Royzen, James W. Canary

Research output: Contribution to journalArticlepeer-review

Abstract

Tripodal ligands containing 8-hydroxyquinoline moieties have been reported with strong binding but perplexing fluorescence properties. Herein we describe the synthesis, photophysical properties and structural characterization of three 8-hydroxyquinoline-based fluorescent Zn(II) probes. Incorporation of the chromophore into a tripodal scaffold resulted in femtomolar sensitivity to the analyte. All three ligands were determined to bind Zn(II) in a 1:1 metal-ligand stoichiometry. Strong zinc affinity was complemented by more than 10-fold fluorescence turn-on. An X-ray crystallographic study revealed very different ligand geometries in the zinc complexes that may influence their spectroscopic behavior.

Original languageEnglish (US)
Pages (from-to)85-91
Number of pages7
JournalPolyhedron
Volume58
DOIs
StatePublished - 2013

Keywords

  • 8-Hydroxyquinoline
  • Femtomolar sensitivity
  • Fluorescence
  • Tripodal ligand
  • X-ray structure
  • Zinc complex
  • Zinc sensor

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Inorganic Chemistry
  • Materials Chemistry

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