A study was undertaken in order to understand the kinetics and mechanism of the chemical oxidation of N,N-diethyl-m-toluamide, an insect repellent, by sulfate radical. In this experiment, sulfate radical was generated using peroxymonosulfate with iron(II) and cobalt(II) as activator. The second-order rate constant for the reaction of the sulfate radical with N,N-diethyl-m-toluamide was found to...

The synthesis, characterization and reactivity of a cobalt(II) complex, [(HL)Co(PyS)](ClO4) (1) (where HL = tris(2-pyridylthio)methane and PyS = monoanionic pyridine-2-thiolate) are discussed. Complex (1) reacts with molecular oxygen to yield a mononuclear low-spin cobalt(III) complex, [(L)Co(PyS)](ClO4) (2). On the other hand, treatment of (1) with a protic acid (pyridinium perchlorate) follow...

The correlation of ATP citrate lyase (ACL) and acetyl CoA levels with trichothecene production in Fusarium graminearum was investigated using an inhibitor (precocene II) and an enhancer (cobalt chloride) of trichothecene production by changing carbon sources in liquid medium. When precocene II (30 µM) was added to inhibit trichothecene production in a trichothecene high-production medium contai...

OBJECTIVE To integrate recent understandings of the mechanisms of genotoxicity and carcinogenicity of the different cobalt compounds. METHOD A narrative review of the studies published since the last IARC assessment in 1991 (genotoxicity, experimental carcinogenesis, and epidemiology). RESULTS Two different mechanisms of genotoxicity, DNA breakage induced by cobalt metal and especially hard...

OBJECTIVES To assess qualitative and quantitative cytotoxicity effect on permanent prosthetic materials to human gingival fibroblasts. METHODS Human gingival tissues were collected (with informed consent) from patients undergoing periodontal surgical procedures and fibroblasts were cultured in vitro. Cell type was determined by performing proteomic analysis. Selected prosthetic materials incl...

Cobalt oxide (Co3O4) nanorods were prepared by a simple co-precipitation method using ethanol solution of cobalt nitrate as precursor and cetyl trimethylammonium bromide (CTAB) as surfactant. Morphological properties of the nanoparticles were characterized. XRD measurement exhibited the structure of Co3O4 nanocrystals for annealed samples. The SEM ima...

in this work, a procedure for preconcentration of cobalt using dispersive liquid–liquid microextraction (dllme) with the reagent 1-nitroso 2-naphtol as complexing reagent was developed. at ph 4, co(ii) was complexed with 1-nitroso 2-naphtol and extracted into the fine droplets formed when mixing chloroform (extraction solvent), ethanol (disperser solvent) and the sample solution. after extracti...

Atom transfer radical addition of bromonitromethane and 1,2-dibromotetrafluoroethane to alkenes is described. The reaction performed under blue light irradiation using two catalysts: 4CzIPN manganese (II) bromide. cyanoarene photocatalyst serves for the redox activation starting organic bromide, while salt facilitates trapping alkyl with formation carbon–bromine bond.

The synthesis of the selenium-based ligand L1SeSeL1 (2,2’-diselanediylbis(N,N-bis(pyridin-2-ylmethyl)ethan-1-amine) is described along with its reactivity cobalt(II) salts. cobalt(II)-diselenide complex [Co2(L1SeSeL1)Cl4] was obtained in good yield, and spectroscopic properties closely resemble that sulfur analog. Reaction Co(II) thiocyanate results formation cobalt(III) compound [Co(L1Se)(NCS)...