Mechanism of "turn-on" fluorescent sensors for mercury(II) in solution and its implications for ligand design.

@article{Lee2012MechanismO,
  title={Mechanism of "turn-on" fluorescent sensors for mercury(II) in solution and its implications for ligand design.},
  author={Hyunjung Lee and Hee-Seung Lee and Joseph H. Reibenspies and Robert D. Hancock},
  journal={Inorganic chemistry},
  year={2012},
  volume={51 20},
  pages={10904-15}
}
The tendency of a Hg(II) ion to strongly quench fluorescence of potential fluorescent sensors is explored. Fluorescence measurements show the expected order of the chelation-enhanced fluorescence (CHEF) effect of Zn(II) > Cd(II) >> Hg(II) ~ Cu(II), which is interpreted as (1) unpaired electrons causing the weak CHEF effect for Cu(II) and (2) the order Zn(II) > Cd(II) >> Hg(II) reflecting the "heavy atom" effect, which may be due to increasing spin-orbit coupling constants (ζ) for Zn(II) < Cd(II… CONTINUE READING