title: Phenol- and catechol-based ruthenium(II) polypyridyl complexes as colorimetric sensors for fluoride ions.
abstract: We report two ruthenium(II) polypyridyl complexes with pendant phenol/catechol functionality that act as colorimetric sensors for fluoride ions. Experiments have revealed that hydrogen bond formation occurs with a slight excess of fluoride ion. However, in higher [F-], deprotonation of the O-H functionality resulted. Time-dependent (TD-DFT) calculations at the B3LYP/LANL2DZ level have shown that new bands appear at longer wavelengths upon complexation with fluoride ions. These are of mixed character, MLCT (dpi(Ru)-->pi*(L1/bpy)), and intra- and interligand [pi(L1)-->pi*(bpy) and pi(L1)-->pi*(L1)] transitions. These complexes also act as sensors for fluoride ions in solvent-water mixtures.
authors.affiliation: Central Salt and Marine Chemicals Research Institute, Bhavnagar 364002, Gujarat, India.
authors.forename: D Amilan
authors.initials: DA
authors.lastname: Jose
authors.forename: Prasenjit
authors.initials: P
authors.lastname: Kar
authors.forename: Debasis
authors.initials: D
authors.lastname: Koley
authors.forename: Bishwajit
authors.initials: B
authors.lastname: Ganguly
authors.forename: Walter
authors.initials: W
authors.lastname: Thiel
authors.forename: Hirendra N
authors.initials: HN
authors.lastname: Ghosh
authors.forename: Amitava
authors.initials: A
authors.lastname: Das