caa a22 4500 467889120 CHVBK 20180406152743.0 cr unu---uuuuu 170328e20060801xx s 000 0 eng 10.1007/s11144-006-0147-7 doi (NATIONALLICENCE)springer-10.1007/s11144-006-0147-7 A novel iron-enhanced pathway for base-catalyzed catechol oxidation by dioxygen [Elektronische Daten] [Zoltán May, László I. Simándi, and Attila Vértes] Summary: The kinetics and mechanisms of the catecholase-type biomimetic activation of O2 by the new dioximatoiron(II) complexes [Fe(Hdmed)]+, [Fe(Hdmpd)]+ and [Fe(H2dmdt)]2+ have been studied in methanol. Kinetic measurements reveal first order behavior with respect to catalyst and O2 and a saturation type dependence on the 3,5-di-tert-butylcatechol (H2dtbc) substrate. Added triethylamine increases the rate by changing the reaction mechanism. An important, hitherto unknown feature is iron(II)-enhanced base catalysis of H2dtbc oxidation, via coordination of HdtbcO2- to the Fe(II) complex present, resulting in a significant acceleration of oxidation. A mechanism involving free radicals is suggested on grounds of ESR evidence. The activity pattern of the catalyst complexes correlates with coordination number and symmetry as revealed by Mössbauer spectra. Springer-Verlag/Akadémiai Kiadó, 2006 oxidation kinetics nationallicence Biomimetic catalysis nationallicence catechol oxidation nationallicence dioximatoiron(II) nationallicence Mössbauer spectra nationallicence May Zoltán Institute of Surface Science and Catalysis, Chemical Research Center, Hungarian Academy of Sciences, H-1525 Budapest, PO Box 17, Hungary aut Simándi László I. Institute of Surface Science and Catalysis, Chemical Research Center, Hungarian Academy of Sciences, H-1525 Budapest, PO Box 17, Hungary aut Vértes and Attila Department of Nuclear Chemistry, L. Eötvös University, Budapest, Hungary aut Reaction Kinetics and Catalysis Letters Kluwer Academic Publishers 89/2(2006-08-01), 349-358 0133-1736 89:2<349 2006 89 11144 https://doi.org/10.1007/s11144-006-0147-7 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s11144-006-0147-7 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- May Zoltán Institute of Surface Science and Catalysis, Chemical Research Center, Hungarian Academy of Sciences, H-1525 Budapest, PO Box 17, Hungary aut NATIONALLICENCE 700 1- Simándi László I. Institute of Surface Science and Catalysis, Chemical Research Center, Hungarian Academy of Sciences, H-1525 Budapest, PO Box 17, Hungary aut NATIONALLICENCE 700 1- Vértes and Attila Department of Nuclear Chemistry, L. Eötvös University, Budapest, Hungary aut NATIONALLICENCE 773 0- Reaction Kinetics and Catalysis Letters Kluwer Academic Publishers 89/2(2006-08-01), 349-358 0133-1736 89:2<349 2006 89 11144 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer