Phenanthroline Complexes Bearing Fused Dipyrrolylquinoxaline Anion
Recognition Sites: Efficient Fluoride Anion Receptors.
Toshihisa Mizuno
Wen-Hao Wei
Leah Renee Eller
Jonathan L. Sessler
10.1021/ja017298t.s001
https://acs.figshare.com/articles/journal_contribution/Phenanthroline_Complexes_Bearing_Fused_Dipyrrolylquinoxaline_Anion_Recognition_Sites_Efficient_Fluoride_Anion_Receptors_/3639663
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 54 000 M<sup>-1</sup> 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.
2002-01-25 00:00:00
phenanthroline
Fused
presence
Efficient
cationic
54 000 M
cobalt
ii
tris
dipyrrolylquinozaline
media
charge
affinity
Dipyrrolylquinoxaline
factor
metal complexes bind fluoride
pyrrole NH protons
Anion
Bearing
ruthenium
spectroscopic
Complexe
electron density
Fluoride
dipyrrolylquinoxaline moieties
Phenanthroline
term
precursor
UV
Site
54 000
electrochemical studies
Receptor
binding constants
DMSO
Novel anion recognition host molecules
Recognition