Three SHOP-type catalysts, in which the C=C(O) double bond was substituted by electron-withdrawing substituents, [Ni{Ph2PC(R1)=C(R2)O}Ph(PPh3)] (2: R1,R2 = -C(Me)=NN(Ph)-; 3: R1 = CO2Et, R2 = Ph; 4: R1 = CO2Et, R2 = CF3), were assessed as ethylene-oligomerisation and -polymerisation catalysts and compared to Keim's complex, [Ni{Ph2PCH=C(Ph)O}Ph(PPh3)] (1). A rationale for the influence of the d...

Spectral data obtained at ESO, Observatoire de Haute-Provence and with the IUE covering the 120 910 nm spectral range allowed us to determine the abundances of 21 elements in the atmosphere of themoderately fast rotatingHg-Mn star γ Corvi.We find that helium, carbon, nitrogen, magnesium, aluminium, silicium, sulfur, chromium, iron and nickel are underabundant with respect to solar values. Beryl...

A wide range of minerals is essential for human health. The recommended dietary allowances (RDAs) serve as guidelines for daily intakes of nutrients that population groups in the United States should have in their diets. Dietary Reference Intakes (DRIs) have been established for the following essential minerals: calcium, phosphorus, and magnesium. In addition, DRIs have been set for other trace...

The effect of chelating phosphines was tested on the structure and pH-dependent stability of nickel-cysteine binding. (1,2-Bis(diphenylphosphino)ethane (dppe) and 1,1,1-tris[(diphenylphosphino)methyl]ethane (triphos) were used with three different cysteine derivatives (L-cysteine, Cys; L-cysteine ethyl ester, CysEt; cystamine, CysAm) to prepare complexes of the form (dppe)NiCysR(n+) and (tripho...

Oxygen Evolution Reaction In article number 2201141, Jun Mei, Ziqi Sun and co-workers design a 2D/2D heterostructured electrocatalyst by coupling mildly oxidized black phosphorus with 2D nickel hydroxide to reach favorable electronic structure desired reconstructed surface towards high-performance alkaline oxygen evolution reaction catalysis.

carbon (C), hydrogen (H), oxygen (O), nitrogen (N), phosphorus (P), potassium (K), sulfur (S), calcium (Ca), magnesium (Mg), boron (B), chlorine (Cl), copper (Cu), iron (Fe), manganese (Mn), molybdenum (Mo), nickel (Ni), and zinc (Zn). These 17 essential elements, also called nutrients, are often split into three groups (fig. 1). The first group is the three macronutrients that plants can obtai...

In the present study the mild steel (MS) specimens were coated with Nickel-Phosphorus (Ni-P) using acrylic bath. Heat treatment was carried out on specimens under different temperatures and time periods in an inert atmosphere. The various mechanical and tribological tests were performed on specimens. Using weight loss method, the corrosion nature of the samples under different environments was ...

A num ber of adducts formed by reacting [NiX(^3-allyl)]2 complexes with optically active tert.phosphines, in which optically active centres are found both at the phosphorus atom and in a substituent, have been isolated and their structures investigated in solution by NM R spectro­ scopy. The absolute configuration of the phosphine in [NiCl{Pmenthyl(M e)Bu'}(773-C3H 5)] has been determ ined by X...