Radioactive nickel chloride (63NiC12) was injected i.v. into rabbits in dosage of 0.24 mg Ni/kg body wt. 63Nj was rapidly cleared from the serum (T112 8.2 h) during the period from 1 h to 2 days after the injection, but slowly (T112 95 h) during the period from 4 to 7 days after the injection. During 24 h after injection of 63NiC12, an average of 90% of serum 63Ni was bound to albumin and 10% w...

We report the first anion photoelectron spectroscopic study of nickel monoxide ~NiO!, nickel dioxide ~ONiO!, and nickel-O2 complex, Ni~O2!. The adiabatic electron affinity ~EA! of NiO is measured to be 1.46 ~2! eV. Five low-lying electronic excited states (A P , a D , B F , b S, c P) are observed for NiO at 0.43 ~4!, 0.94 ~4!, 1.24 ~3!, 1.80 ~10!, and 2.38 ~10! eV above the ground state, respec...

An iridium photocatalyst and visible light facilitate a room temperature, nickel-catalyzed coupling of (hetero)aryl bromides with activated α-heterosubstituted or benzylic C(sp3)-H bonds. Mechanistic investigations on this unprecedented transformation have uncovered the possibility of an unexpected mechanism hypothesized to involve a Ni-Br homolysis event from an excited-state nickel complex. T...

Native nickel of composition Ni 96"3 ~, Fe 1"77 ~, and Co 0'69 ~ was found as tiny flakes up to o'75 mm across in a heavy mineral concentrate from stream sediments in the Jerry River, South Westland, New Zealand. The locality is approximately I3 km downstream from the original locality for awaruite (Ni~Fe), and it is shown that the nickel content of detrital grains increases with distance from ...

Variations of the electronic properties of nickel during the first stages of oxidation were studied by means of the soft x-ray appearance potential spectroscopy (APS). The spectra consist of a superposition of contributions from metallic nickel and from NiO and yield no evidence for a con­ tinuous change of the oxidation state of the Ni atoms. The binding energy of the 2p3/2-electrons in metall...

Mesostructured nickel oxide was formed with nickel sulfate and cationic surfactant cetyltrimethylammonium bromide (CTAB). X-ray diffraction (XRD) peaks at low scattering angles and transmission electron microscopy (TEM) indicated that a mesostructure was formed. However, these XRD patterns disappeared after calcination. The addition of sodium silicate in the precursor solutions produced a mesos...

Nickel-catalyzed coupling reactions provide exciting tools in chemical synthesis. However, most methodologies in this area require high catalyst loadings, which commonly range from 10-20 mol % nickel. Through an academic-industrial collaboration, we demonstrate that kinetic modeling can be used strategically to overcome this problem, specifically within the context of the Ni-catalyzed conversio...

The interactive effects of nickel (Ni) and ascorbic acid (AsA) and gibberellin (GA3) on soybean seedlings (Glycine max L. cv. Union × Elf) were examined. Seven-day old hydroponically-grown seedlings were exposed to NiCl2, 6H2O (0.5 mM), either with or without AsA (1 mM) or GA3 (0.05 mM) or AsA (1 mM) plus GA3 (0.05 mM), for five days. Nickel toxicity symptoms, such as formation of reddish-brown...

4,7-Dithiadecane-2,9-dione dioxime forms both violet and purple-black nickel(II) complexes with unexpected structural properties, quite unlike the square-planar chelates formed by its dithiaundecane homologue. Their perchlorate salts were isolated and examined crystallographically. The lilac product [Ni{(Dtox)(CH(3)CNH)(2)}](ClO(4))(2) entails a bis(iminoether) ligand formed by coupling of the ...

The presence of nanoparticles in many industrial applications and daily products is making it nowadays crucial to assess their impact when exposed to the environment. Metallic nickel nanoparticles (Ni NPs) are of high industrial interest due to their ability to catalyze the reversible hydration of CO2 to carbonic acid at ambient conditions. We characterized metallic Ni NPs by XRD, HRTEM and EDS...