In this study, we have analysed the influence of cation?? interactions on stability and properties superoxide dismutase (SOD) active centres. The number formed by arginine is higher than lysine in cationic group, while those histidine are comparatively ? group. energy contribution resulting from most frequent was lower range strong hydrogen bonds. involving transition metal ions as cation more ...

Lithium ion batteries are encountering ever-growing demand for further increases in energy density. Li-rich layered oxides are considered a feasible solution to meet this demand because their specific capacities often surpass 200 mAh g-1 due to the additional lithium occupation in the transition metal layers. However, this lithium arrangement, in turn, triggers cation mixing with the transition...

The orthorhombic B31 structure, typified by MnP, is interpreted as a distortion of the hexagonal NiAs (B8j) structure due to metal-metal bonding within the hexagonal basal planes. The number of d-like electrons per cation is known from the chemical formula provided the Fermi level lies in an energy gap between filled and empty bands of broad-band states, as is generally the case where there is ...

The transport of Fe(2+) and other divalent transition metal ions across the intestinal brush border membrane (BBM) was investigated using brush border membrane vesicles (BBMVs) as a model. This transport is an energy-independent, protein-mediated process. The divalent metal ion transporter of the BBM is a spanning protein, very likely a protein channel, that senses the phase transition of the B...

The solvated title compound, [ZnCl2(C20H17BrN2)]·0.5CH2Cl2, comprises a bidentate imino-pyridine ligand and two Cl atoms bound to a zinc2+ cation in a distorted tetra-hedral arrangement. The chelate bond lengths are consistent with localized C=N double bonds and a C-C single bond, as expected for an unreduced ligand bound to a closed-shell transition metal cation. Apart from weak nonclassical C...

Transition-metal-substituted  (TMS)  polyoxometalates  of  the  general  formula  [SiW9M3O39], (where M = first row transition metal), has been synthesized and supported on anatase by sol–gel method under oil-bath condition. The tetrabutylammonium (TBA) salts of the Keggin-type polyoxotungstates  [SiW9M3O39],  (M = VII, CrII, MnII,  FeII CoII  and NiII),  proved  to  be  green, reusable,  and  ...

The high-performance separation of alkaline earth and transition metal ions on a bare porous silica 10.0 cm× 0.46 cm monolith (Merck Chromolith Si) was achieved using solvent enhanced ion chromatography. Using acetonitrile or methanol based ammonium and sodium acetate buffered mobile phases, the effect upon cation retention of mobile phase ionic strength, organic content and pH were evaluated. ...

The local atomic structure of habit-modifying transition metal cations within the crystal lattice of potassium dihydrogen phosphate (KDP) is investigated using X-ray absorption spectroscopy (XAS) and X-ray standing wave (XSW) spectroscopy, together with molecular modeling. XAS reveals the transition metal cations to be structurally incorporated into the crystal lattice as an ionic complex that ...

Organocalcium compounds have been reported as efficient catalysts for various alkene transformations. In contrast to transition metal catalysis, the alkenes are not activated by metal-alkene orbital interactions. Instead it is proposed that alkene activation proceeds through an electrostatic interaction with a Lewis acidic Ca(2+) . The role of the metal was evaluated by a study using the metal-...