Journal
DYES AND PIGMENTS
Volume 141, Issue -, Pages 493-500Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.dyepig.2017.03.011
Keywords
Coumarin-pyrazolone-pyridine triad; Tautomerism; Anion detection; DFT calculations; PET; ESIPT
Funding
- Scientific and Technological Research Council of Turkey (TUBITAK) [113Z895, 114Z790]
- Turkish National Academy of Sciences
- Science Academy Foundation
- METU Parlar Foundation
- TUBITAK
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A coumarin based anion sensor utilizing pyrazole both as an electron donor and hydroxyl H-bond donor and pyridine as a tautomer stabilizer is reported. The chemosensor exhibits ON-OFF-ON states and is more sensitive to F- at the stoichiometric ratio of 1:1. The OFF state is due to PET and the role of pyrazole is two fold, both stabilization of the enol tautomer via H-bonding and hosting domain of electrons enabling PET. Moreover, the absorption and emission properties of chemosensor change drastically upon acidification. (C) 2017 Elsevier Ltd. All rights reserved.
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