Dóra Lakk-Bogáth

Formation, Characterization, and Reactivity of a Nonheme Oxoiron(IV) Complex Derived from the Chiral Pentadentate Ligand asN4Py

The chiral pentadentate low-spin (S = 1) oxoiron(IV) complex [FeIV(O)(asN4Py)]2+ (2) was synthesized and spectroscopically characterized. Its formation kinetics, reactivity, and (enantio)selectivity in an oxygen-atom-transfer reaction was investigated in detail and compared to a similar pentadentate ligand-containing system.

Oxoiron(IV)-mediated Baeyer–Villiger oxidation of cyclohexanones generated by dioxygen with co-oxidation of aldehydes

In this communication we describe detailed mechanistic studies on the [FeII(CH3CN)(N4Py)(ClO4)]ClO4-catalyzed (N4Py = N,N-bis(2-pyridylmethyl)-N-bis(2-pyridyl)methyl-amine) Baeyer–Villiger oxidation of cyclohexanones by dioxygen with cooxidation of various aldehydes, including the kinetics of the formation and the reactivity of the trapped and spectroscopically characterized oxoiron(IV) intermediate.

Comparison of heme and nonheme iron-based 1-aminocyclopropane-1-carboxylic acid oxidase mimics: kinetic, mechanistic and computational studies

Kinetic, mechanistic and computational studies of the H2O2 oxidation of 1-aminocyclopropane-1-carboxylic acid (ACCH) to ethylene by heme, [Fe(III) (TPP)Cl] (TPP = meso-tetraphenylporphyrin), and nonheme-type iron complex, [Fe(II)(CH3CN)(N4Py)](ClO4)2 (N4Py = N,N-bis(2-pyridylmethyl)-N-bis(2-pyridyl)methylamine), are described as biomimics of 1-aminocyclopropane-1-carboxylic acid oxidase (ACCO).

CCDC 1516132: Experimental Crystal Structure Determination

Related Article: Robert Csonka, Dora Lakk-Bogath, Agnes Gomory, Laszlo Drahos, Michel Giorgi, Gabor Speier, Robert K. Szilagyi, Jozsef Kaizer|2017|Inorg.Chim.Acta|||doi:10.1016/j.ica.2017.07.065

Divastartalmú oxidoreduktázok szerkezeti és funkcionális modelljei

rendelkezik, stabilis és ezért szingulett-állapotú szerves szubsztrátumokkal szemben inert. A lényegesen nagyobb energiatartalmú, instabilabb szingulett-állapotú dioxigén reaktivitása nagyobb és redoxireakciókban, valamint elektrociklikus reakciókban (pl. olefinekkel, Diels-Aldertípusú reakciókban) jól reagál. A dioxigénnek a redoxireakciókban mutatott viszonylagos inertsége az elsõ elektron termodinamikailag kedvezõtlen felvételével is magyarázható (E0 = -0,32 V). A spin-tiltott folyamat tehát a dioxigén fotooxidációs, illetve átmenetifémekkel történõ oxidatív-addíciós reakciójával oldható fel.