404892-62-2Relevant articles and documents
Phenanthroline complexes bearing fused dipyrrolylquinoxaline anion recognition sites: Efficient fluoride anion receptors
Mizuno, Toshihisa,Wei, Wen-Hao,Eller, Leah Renee,Sessler, Jonathan L.
, p. 1134 - 1135 (2007/10/03)
Novel anion recognition host molecules, tris-1,10-phenanthroline cobalt(III) and bis-2,2-bipyridine mono-1,10-phenanthroline ruthenium(II) complexes bearing fused dipyrrolylquinoxaline moieties have been synthesized. As determined by UV-vis spectroscopic and electrochemical studies, these metal complexes bind fluoride with high affinity in polar media both in absolute terms and relative to the metal-free phenanthroline dipyrrolylquinozaline precursor from which they are derived (fluoride is bound to the tris-1,10-phenanthroline cobalt(III) dipyrrolylquinoxaline system with a 1:1 binding constant of 54000 M-1 in DMSO). The large observed binding constants are ascribed to two factors, (i) the presence of a phenanthroline-coordinated cationic charge that decreases the electron density on the pyrrole NH protons and (ii) pure electrostatic effects. Copyright