Materials Literature
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The gas-phase reactions of molybdenum oxide cluster ions Mo x O y + ( x = 1−3, y = 1−9) with small alcohols have been investigated using Fourier transform ion cyclotron resonance mass spectrometry. The product branch ratios are reported. The reactions of Mo x O y + with alcohols can be envisioned as proceeding via met…
The non-hydrolytic sol–gel route has been used in the solvent-free synthesis of binary inorganic oxides based on silicon, aluminium and titanium. Where necessary, iron(iii) chloride was used as a catalyst. Clear evidence for the formation of true, amorphous binary systems was obtained only in the case of aluminosilica…
The ab initio determination of relatively complex crystal structures of flexible molecules without the need for single crystals is discussed. A method is described based on simulated annealing in which the powder diffraction patterns of randomly generated trial structures are calculated and compared with the observed…
Time-resolved in situ Raman spectroscopy was used to follow the decomposition of supported crystalline BaO 2 into defect-rich BaO. This decomposition occurred under O 2 partial pressures which were small compared to those expected from a calculated phase diagram. However, the O 2 partial pressures at which this BaO 2…
Different crystal forms of ibuprofen (IBF) were prepared using methods such as cooling hot solution of the drug and precipitation of crystals from the drug solution. Scanning electron microscopy (SEM), differential scanning calorimetry (DSC), melting point, x-ray powder diffractometry, infrared absorption spectroscopy…
The europium(II)-doped aluminates, SrAl2O4 and CaAl2O4with β-tridymite structure and BaMgAl10O17 with β-Al2O4 structure, have been investigated by means of EPR spectroscopy. From the complicated X-band EPR spectra observed for SrAl2O4:Eu,Dy and CaAl2O4:Eu,Nd it is deduced that they have large zero-field splittings in…
A rhenium(I) complex with boronic acid pendant is synthesized and characterized; the complex is shown to exhibit pH dependent electronic absorption characteristics; the photophysical properties and sugar sensing behaviour are also investigated.
We report measurements of the absolute differential cross sections for charge transfer scattering of 0.5-, 0.85-, 1.5-, 2.8-, and 5-keV ${\mathrm{O}}^{+}$ by ${\mathrm{N}}_{2}$ at scattering angles between 0.04\ifmmode^\circ\else\textdegree\fi{} and 3.1\ifmmode^\circ\else\textdegree\fi{} in the laboratory frame. Cross…
Simple dissolution of 3:1 mixtures of aromatic carboxylic acids with suitable solubilising groups and tris(4,5- dihydroimidazol-2-yl)benzene 6 gave branched hydrogen-bonded assemblies 7 that were soluble in chlorinated and aromatic solvents.
We report the synthesis, crystal structure, physical properties and hydrolysis kinetics of [(O)(tmpa)V(IV)(&mgr;-O)V(V)(tmpa)(O)](3+) (tmpa = tris(2-pyridylmethyl)amine), the first cation in its class for which both solid state and solution-phase characteristics are fully consistent with expectations for a Robin-Day t…
Complexation of a bipyridine-based nitronyl nitroxide biradical with nickel(II) affords two complexes that differ by the nature of one axial ligand and by their magnetic behaviour: in both cases ferromagnetic interactions between high-spin nickel(II) and the radicals are observed.
The synthesis and mesomorphic properties of a homologous series ofN-(2-hydroxy-4-n-alkoxybenzylidene)-3′,4′-di-n-alkoxylanilines and their copper(ii) complexes bis[(N-3′,4′-dialkoxyphenyl)-4-n-alkoxylsalicylaldiminato]copper(ii) are reported. The disc-like copper complexes exhibited columnar hexagonal disordered mesop…
A wide variety of extracted and synthesised drug molecules have electron transfer capabilities which allow them to generate reactive oxygen species (ROS). In particular, many antibiotics that kill or inhibit bacteria, yeasts and cancer cells readily transfer electrons to oxygen making superoxide and hydrogen peroxide…
Simulation of surfaces and grain boundaries of α-alumina were carried out by the molecular dynamics method using an ionic pair potential. Simulation of five different surfaces, (1101), (1104), (1102), (1120), (0001), showed that, although a distorted structure formed at the surface, the calculated surface energies (γs…
The thermal resistance of the attachment between a die and its carrier contributes strongly to the total temperature rise in an electronic system. The die attach resistance often differs substantially from the value predicted using the bulk thermal conductivity of the attachment material because of partial voiding and…
The purpose of the study was to investigate the staining mechanism of acid fuchsin and Sirius red. Acid (poly-glutamic acid), neutral (poly-hydroxyproline) and basic (poly-arginine, poly-histidine, poly-lysine) poly-amino acids, collagen types I, II and III, and arginine- and lysine-containing histones were used as te…
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We have designed a hyper-Rayleigh scattering scheme to measure six scalar invariants of the squared hyperpolarizability tensor β2. Our theoretical approach expresses the rotational invariants of the irreducible β components as scalars, which eliminates the need for difficult frame transformations. We applied our schem…
The stability of A1H3SiO 2+, the aqueous complex formed in acid solutions between AI 3+ and H4SiO4~ has been recently quantified in the temperature range 25-300~ at Psat (Pokrovski et al., 1996; Salvi et al., 1998). It was found that the stability of A1H3SiO] + strongly increases with temperature and this complex can…
The immobilisation of molybdate on Mg,Al-LDH leads to an active, heterogeneous catalyst that generates singlet molecular oxygen from hydrogen peroxide in the absence of soluble base.