Phenol- and catechol-based ruthenium(II) polypyridyl complexes as colorimetric sensors for fluoride ions |
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Authors: | Jose D Amilan Kar Prasenjit Koley Debasis Ganguly Bishwajit Thiel Walter Ghosh Hirendra N Das Amitava |
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Affiliation: | Central Salt and Marine Chemicals Research Institute, Bhavnagar 364002, Gujarat, India. |
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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. |
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