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)...

The title complex, [CoNa(CO5P)(H2O)5]n, was obtained by reacting sodium phosphono-formate with cobalt nitrate. The complex contains cobalt(II) and sodium ions, which are bridged by the O atoms of two aqua ligands. The Co(II) ion is octahedrally coordinated by three phosphonoformato ligands (one bi- and the other monodentate) and by two O atoms from the bridging aqua ligands. The sodium cation i...

The complex formation between cobalt(II) and chloride ions in molten NH4NO3·2.61H2O, NH4NO3·CH3CONH2·1.61H2O and NH4NO3·2.61CH3CONH2 has been investigated. Absorption spectra of cobalt(II) chloride containing variable amounts of ammonium chloride were recorded at 45 to 60 ◦C. In the absence of chloride, the solutions show spectra typical for octahedral co-ordination of cobalt(II). Addition of c...

A flowthrough spectrophotometric sensor for the determination of cobalt at the nanogram per millilitre level using pyridoxal 4-phenylthiosemicarbazone as reagent and integrated preconcentration and detection in the flow cell is proposed. The method is highly selective for cobalt(II); it features detection and determination limits of 0.02 and 0.06 mug ml(-1) respectively, and a linear range of a...

A self-assembly reaction between the ditopic ligand 4,5-bis(tetrazol-5-yl)imidazole (H3IBT) and cobalt(II) chloride in basic aqueous medium afforded the mixed-valence molecular species ðNBu4Þ141⁄2Co III 6Co II 2ðIBTÞ12 22H2O (1). X-ray analysis of 1 revealed a cubic arrangement of six trivalent and two divalent cobalt ions, with the latter situated on opposing vertices along the cube diagonal. ...

Although cobalt is an essential trace element, it is toxic in high concentrations. Long-term exposure to cobalt chloride (CoCl2) significantly increases Co(II) ions in blood serum, spleen and liver of treated immature mice compared to controls and induces changes in the iron (Fe) content. Spleen and liver show different sensitivity to Co(II) administration but increase iron storage. The three e...

MALDI-TOF mass spectrometry, 1H NMR spectrometry, the continuous variation method and molecular modeling by MM3 calculation confirmed our earlier studies showing that gonadotropin-releasing hormone (GnRH) forms complex with copper(II) ion with the binding ratio 1:1. The copper(II) complex formed at physiological pH has a square planar configuration and GnRH complexes with nickel(II) and cobalt(...

background & aims of the study: heavy metals discharge to environment is a worldwide problem growing in scale. when they accumulate in the environment and in food chains, they can profoundly disrupt biological processes. peganum harmala seeds (phs) was used as a bio-sorbent, using a continuous system for removing pb2+, co2+, ni2+ and cu2+ ions from aqueous solutions. materials and methods: phs ...

This paper focuses on how the surface chemical groups of sheep manure affect the adsorption capacity of cobalt ions. Improvement in cobalt ions uptake onto sheep manure was achieved successfully by introducing more carboxylic functional groups into its surface due to citric acid treatment. According to Langmuir model, cobalt ions uptake was increased from 22.88 mg/g for dried sheep manure (D-SM...

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...