title: Coumarin Based Highly Selective "off-on-off" Type Novel Fluorescent Sensor for Cu2+and S2-in Aqueous Solution.
abstract: Solvent free synthesis of 6,7-dihydroxy-3-(3-chlorophenyl) coumarin (CFHC) was designed and obtained by the interaction of 2-(2,4,5-trimethoxyphenyl)-1-(3-chlorophenyl)acrylonitrile with pyridinium hydrochloride in the presence of silica gel by using microwave irradiation. The characterization of CFHC was confirmed by FT-IR,1H,13C,13C-APT and 2D HETCOR spectroscopy methods. The optical behavior of CFHC towards metal ions was investigated by UV-visible and fluorescence spectroscopy. CFHC showed "on-off" type fluorescence response towards Cu2+with high selectivity in aqueous solution (CH3CN/H2O, 9/1, v/v). Once binding with Cu2+, CFHC-Cu2+complex also displayed high selectivity for sulfide, resulting in "off-on" type sensing of sulfide anion. Graphical abstract Visual fluorescence changes upon addition of various metal ions (5.0 eq.) to CFHC in CH3CN/H2O (90:10, v/v) under UV excitation (365 nm).
authors.affiliation: Kamil Ozdag Science Faculty, Karamanoglu Mehmetbey University, 70100, Karaman, Turkey.
authors.forename: Şükriye Nihan
authors.initials: ŞN
authors.lastname: Karuk Elmas
authors.affiliation: Science Faculty, Firat University, 23119, Elazıg, Turkey.
authors.forename: Furkan
authors.initials: F
authors.lastname: Ozen
authors.affiliation: Science Faculty, Firat University, 23119, Elazıg, Turkey.
authors.forename: Kenan
authors.initials: K
authors.lastname: Koran
authors.affiliation: Kamil Ozdag Science Faculty, Karamanoglu Mehmetbey University, 70100, Karaman, Turkey. iyilmaz@kmu.edu.tr.|Kamil Ozdag Science Faculty, Karamanoglu Mehmetbey University, 70100, Karaman, Turkey. iyilmaz@kmu.edu.tr.
authors.forename: Ibrahim
authors.initials: I
authors.lastname: Yilmaz
authors.affiliation: Science Faculty, Firat University, 23119, Elazıg, Turkey.
authors.forename: Ahmet Orhan
authors.initials: AO
authors.lastname: Gorgulu
authors.affiliation: Science Faculty, Selcuk University, 42075, Konya, Turkey.
authors.forename: Serkan
authors.initials: S
authors.lastname: Erdemir
keywords: Copper; Coumarin; Fluorescent; Sensor; Sulfide