Alkynyl ruthenium colorimetric sensors: optimizing the selectivity toward fluoride anion.
We report on the synthesis of alkynyl ruthenium colorimetric sensors whose receptors are constituted by thiazolidinedione, rhodanine, or barbituric heads as recognition centers for anions. As modifications in the charge density at these recognition centers affect the whole molecule, through the alkynyl ligand acting as a communicating wire, the effects of hydrogen-bonding interactions with the anions were observed with the naked eye and monitored by UV-vis absorption spectrometry. The selectivity of the sensors was improved through electronic modifications of the alkynyl ruthenium subunit: the higher the electron density at the receptor head, the higher the selectivity is. TD-DFT calculations rationalize the long-range electronic communication as a main characteristic of the alkynyl ruthenium species and as a key to improve the selectivity of alkynyl ruthenium-based sensors toward anions.
Fillaut
Jean-Luc
JL
UMR 6226 CNRS - Université Rennes 1, Sciences chimiques de Rennes, Avenue du Général Leclerc, 35042 Rennes, France. jean-luc.fillaut@univ-rennes1.fr
Andriès
Julien
J
Perruchon
Johann
J
Desvergne
Jean-Pierre
JP
Toupet
Loïc
L
Fadel
Lotfi
L
Zouchoune
Bachir
B
Saillard
Jean-Yves
JY
D000838:Anions / Q000737:chemistry; D002621:Chemistry / Q000379:methods*; D003124:Colorimetry / Q000379:methods*; D003460:Crystallization; D005459:Fluorides / Q000737:chemistry*; D006860:Hydrogen Bonding; D007477:Ions; D008024:Ligands; D008752:Methylene Chloride / Q000737:chemistry; D008956:Models, Chemical; D008958:Models, Molecular; D008968:Molecular Conformation; D012428:Ruthenium / Q000737:chemistry*; D013056:Spectrophotometry, Ultraviolet / Q000379:methods*
D000838:Anions; D007477:Ions; D008024:Ligands; D008752:Methylene Chloride; D012428:Ruthenium; D005459:Fluorides