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IR spectroelectrochemistry as efficient technique for elucidation of reduction mechanism of chlorine substituted 1,10-phenanthrolines
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SYSNO ASEP 0522241 Druh ASEP J - Článek v odborném periodiku Zařazení RIV J - Článek v odborném periodiku Poddruh J Článek ve WOS Název IR spectroelectrochemistry as efficient technique for elucidation of reduction mechanism of chlorine substituted 1,10-phenanthrolines Tvůrce(i) Wantulok, J. (PL)
Degano, I. (IT)
Gál, M. (SK)
Nycz, J. E. (PL)
Sokolová, Romana (UFCH-W) RID, ORCID, SAIČíslo článku 113888 Zdroj.dok. Journal of Electroanalytical Chemistry. - : Elsevier - ISSN 1572-6657
Roč. 859, FEB 2020 (2020)Poč.str. 10 s. Jazyk dok. eng - angličtina Země vyd. CH - Švýcarsko Klíč. slova 1,10-Phenanthroline ; Chromatography ; IR spectroelectrochemistry ; Reduction mechanism ; UV–Vis spectroelectrochemistry Vědní obor RIV CG - Elektrochemie Obor OECD Electrochemistry (dry cells, batteries, fuel cells, corrosion metals, electrolysis) CEP GA19-03160S GA ČR - Grantová agentura ČR Způsob publikování Omezený přístup Institucionální podpora UFCH-W - RVO:61388955 UT WOS 000521509300036 EID SCOPUS 85078398228 DOI 10.1016/j.jelechem.2020.113888 Anotace The electrochemical behaviour of 4,7-dichloro-1,10-phenanthrolines was studied in non-aqueous solution using cyclic voltammetry, controlled potential electrolysis, in-situ UV–Vis and IR spectroelectrochemistry, and HPLC-DAD (HPLC with diode array detector) and HPLC-MS/MS techniques. The substitution of phenanthrolines at position C2 and C5 with methyl groups, chlorine and/or fluorine atoms influences the redox properties and the potential gap between the oxidation and reduction potentials. Reduction leads to the formation of a radical anion and the subsequent cleavage of halide from the molecule. Compounds containing also chlorine or fluorine atoms at position C5 were found to be the most easily reduced. The oxidation of 4,7-dichloro-1,10-phenanthrolines proceeds primarily on the conjugated aromatic rings of phenanthroline forming a short living radical cation at the first oxidation wave and a dication at the second oxidation wave. The changes of the absorption spectra during IR spectroelectrochemistry suggested the formation of an unstable species, whose dimeric structure was hypothesized. Frontier molecular orbitals calculations and theoretical calculations of IR spectra support the findings. Pracoviště Ústav fyzikální chemie J.Heyrovského Kontakt Michaela Knapová, michaela.knapova@jh-inst.cas.cz, Tel.: 266 053 196 Rok sběru 2021 Elektronická adresa http://hdl.handle.net/11104/0306764
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