Competition between energy transfer quenching and chelation enhanced fluorescence in a Cu (II) coordinated conjugated polymer system.

Academic Article


  • An investigation of the mechanism of the fluorescence quenching by Cu(2+) for a conjugated polymer system initially designed as a fluorescence "turn-on" chemosensor based on chelation enhanced fluorescence (CHEF) is described in this paper. Unlike all other metal cations tested, the polymer/Cu(2+) hybrid system with a 1:1 ratio between the receptor and Cu(2+) has only weak fluorescence with lambda(max) = 490 nm and a quantum yield of 0.004 in THF at room temperature. In solvent glasses at 77 K the fluorescence remained quenched suggesting that the quenching mechanism was due to energy transfer between the Cu(2+) and the conjugated polymer backbone. The energy transfer quenching competes effectively with the electron transfer involved in the CHEF resulting in a more selective chemosensory system.
  • Authors

  • Fan, Li-Juan
  • Martin, Justin J
  • Jones, Wayne
  • Status

    Publication Date

  • May 2009
  • Published In


  • Alkynes
  • Chelating Agents
  • Copper
  • Energy Transfer
  • Ethers
  • Fluorescence
  • Organometallic Compounds
  • Polymers
  • Spectrometry, Fluorescence
  • Temperature
  • Titrimetry
  • Water
  • Digital Object Identifier (doi)

    Pubmed Id

  • 19096917
  • Start Page

  • 555
  • End Page

  • 559
  • Volume

  • 19
  • Issue

  • 3