23 research outputs found
Degradation of monuron in aqueous solution by ionizing radiation
In this study ionizing radiation induced degradation of monuron was investigated by γradiolysis. γ-radiolysis is one of the Advanced Oxidation processes (AOPs) which is very effective method for the degradation of organic water pollutants. The end-products and transient intermediates were studied in order to describe the degradation mechanism. The main reaction is OH● addition to the aromatic ring forming hydroxyl-cyclohexadienyl type radicals. In addition to this radical, aminyl and phenoxyl radicals have also some contribution to the degradation. Monuron as a halogenated compound is sensitive to the hydrated electron attack. Due to the oxidation, chemical oxygen demand and total organic carbon content decreases during irradiatin treatment. The efficiency of oxidation is high compared to other aromatics. Both, OH● and eaq take part in the dehalogenation reactions
Copper-catalyzed oxygenation of 3-hydroxy-2-phenylquinolin-4(1H)-one: Synthesis, structure and spectral properties of [Cu(idpa)(N-baa)]ClO4, [idpa=3,3'-iminobis(N,N-dimethylpropylamine), N-baaH = N-benzoylanthranilic acid]
Iron(III) Complexes with Meridional Ligands as Functional Models of Intradiol-Cleaving Catechol Dioxygenases
Iron(III) Complexes with Meridional Ligands as Functional Models of Intradiol-Cleaving Catechol Dioxygenases
Six dichloroiron(III) complexes of 1,3-bis(2′-arylimino)isoindoline
(BAIH) with various N-donor aryl groups have been characterized by
spectroscopy (infrared, UV–vis), electrochemistry (cyclic voltammetry),
microanalysis, and in two cases X-ray crystallography. The structurally
characterized Fe<sup>III</sup>Cl<sub>2</sub>(L<sup><i>n</i></sup>) complexes (<i>n</i> = 3, L<sup>3</sup> = 1,3-bis(2′-thiazolylimino)isoindoline
and <i>n</i> = 5, L<sup>5</sup> = 1,3-bis(4-methyl-2′-piridylimino)isoindoline)
are five-coordinate, trigonal bipyramidal with the isoindoline ligands
occupying the two axial and one equatorial positions meridionally.
These compounds served as precursors for catechol dioxygenase models
that were formed in solution upon addition of 3,5-di-<i>tert</i>-butylcatechol (H<sub>2</sub>DBC) and excess triethylamine. These
adducts react with dioxygen in <i>N</i>,<i>N</i>-dimethylformamide, and the analysis of the products by chromatography
and mass spectrometry showed high intradiol over extradiol selectivity
(the intradiol/extradiol product ratios varied between 46.5 and 6.5).
Kinetic measurements were performed by following the change in the
intensity of the catecholate to iron ligand-to-metal charge transfer
(LMCT) band, the energy of which is influenced by the isoindolinate-ligand
(827–960 nm). In combination with electrochemical investigations
the kinetic studies revealed an inverse trend between reaction rates
and oxidation potentials associated with the coordinated DBC<sup>2–</sup>. On the basis of these results, a substrate activation mechanism
is suggested for this system in which the geometry of the peroxide-bridged
intermediate may be of key importance in regioselectivity
Mechanism and identification of reaction byproducts for the degradation of Chloramphenicol drug in heterogeneous photocatalytic process
Effectiveness of a 3-liter reactor with UV and persulfate in degrading chloramphenicol in water
Photocatalytic degradation of clofibric acid by g-C3N4/P25 composites under simulated sunlight irradiation: The significant effects of reactive species
Chromophores, Fluorophores and Robust Ancillary Ligands for Molecular Catalysts: 1,3-Bis(2-pyridylimino)isoindolines
Since the first report in the early 1950s, 1,3-bis(2-pyridylimino)isoindolines (BPIs) have found widespread applications in organic, inorganic and materials chemistry. This microreview focuses on recent progress towards chiral BPI derivatives as ligands for enantioselective catalysis as well as developments in the use of BPI complexes in materials science, focusing on luminescent and birefringent materials