New thiophene-based azo ligands containing azo methine group in the main chain for the determination of copper(II) ions

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dc.contributor.authorDincalp, Haluk
dc.contributor.authorToker, Fatih
dc.contributor.authorDutucasu, Inci
dc.contributor.authorAvcibasi, Nesibe
dc.contributor.authorIcli, Siddik
dc.date.accessioned2019-10-27T19:37:26Z
dc.date.available2019-10-27T19:37:26Z
dc.date.issued2007
dc.departmentEge Üniversitesien_US
dc.description.abstractNew kind of azo chromophores containing thiophene moiety and salicyaldimine-based ligand as side chains have been synthesized by a sequential process for optical sensing of Cu2+ metal ions in organic solution. Compounds have been characterized by IR and UV-vis spectrophotometer, H-1 NMR, C-13 NMR, MS, TGA and CV instruments. Spectral characteristics of the synthesized compounds have been investigated in five organic solvents of different polarity. Polarizibility effects of the solvents on the spectral characteristics and the dipole moments in the excited state are estimated. The fluorescence quantum yields of the synthesized compounds have been calculated to be in the range of 0.0035-0.0095 in solvents of different polarity. The fluorescence emission quenching experiments between the synthesized compounds and electron donor (pyrene, anthracene), electron acceptor (Co2+) compounds give the bimolecular quenching rate constants of 10(11) and 10(14) M-1 s(-1), respectively. The free energies of photo-electron transfer process (Delta G(ET)) between the azo dyes and the quenchers have been found to be about -19 kcal/mol. Cyclic voltammetry studies indicate that synthesized azo ligands undergo two- or three-reversible reduction potentials (versus ferrocene) and give LUMO energy value of -3.07 eV which is lower than that of TiO2 conduction band and has a band gap value of similar to 2.5 eV. These results may point that synthesized azo, dyes could be used as hole conducting materials in solid DSSC (Dye Sensitized Solar Cell) devices. Thermal decomposition behavior of the azo dyes gives more information about the structure of the studied materials. The photoisomerization behavior of the synthesized compounds has been investigated in ethyl acetate under Xe lamp irradiation in the fluorescence spectrophotometer for 1 h. Photoisomerization rate constants of cis-trans orientation (k(c-t)) have been found to be about 10(-5) s(-1). The complexation process of synthesized thienylidene azo dyes gives subtle changes in their absorption spectra. (C) 2006 Elsevier Ltd. All rights reserved.en_US
dc.identifier.doi10.1016/j.dyepig.2006.05.015
dc.identifier.endpage24en_US
dc.identifier.issn0143-7208
dc.identifier.issn0143-7208en_US
dc.identifier.issue1en_US
dc.identifier.scopusqualityQ1en_US
dc.identifier.startpage11en_US
dc.identifier.urihttps://doi.org/10.1016/j.dyepig.2006.05.015
dc.identifier.urihttps://hdl.handle.net/11454/39974
dc.identifier.volume75en_US
dc.identifier.wosWOS:000246549500002en_US
dc.identifier.wosqualityQ1en_US
dc.indekslendigikaynakWeb of Scienceen_US
dc.indekslendigikaynakScopusen_US
dc.language.isoenen_US
dc.publisherElsevier Sci Ltden_US
dc.relation.ispartofDyes and Pigmentsen_US
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanıen_US
dc.rightsinfo:eu-repo/semantics/closedAccessen_US
dc.subjectthienylidene azo dyeen_US
dc.subjectazo methineen_US
dc.subjectsolvatochromismen_US
dc.subjectphotoisomerizationen_US
dc.subjectStern-Volmeren_US
dc.subjectcomplex formationen_US
dc.titleNew thiophene-based azo ligands containing azo methine group in the main chain for the determination of copper(II) ionsen_US
dc.typeArticleen_US

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