Materials Literature
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The chemistry of binary and multinary silver oxides spans from subvalent species (with a mean oxidation number for Ag smaller than + 1) to compounds with Ag in high oxidation states as + 2 and + 3. We have investigated a range of silver oxides, including the binary compounds Ag2O, AgO, Ag3O4 and Ag2O3 as well as subva…
has been synthesized under high oxygen pressure from a precursor prepared by means of a sol-gel method. The material obtained is of single phase and has an orthorhombic crystal structure at room temperature. The magnetic, electrical and thermal properties have been measured over a wide temperature range. This compound…
A novel porphyrin-fused porphyrin is formed by an oligomerization reaction of a (porphyrinato)nickel complex with TeCl4; the isolated compound, [2]porphyracene, was characterized by spectroscopic methods and direct observation using scanning tunnelling microscopy; the excitation energy value of 13460 cm–1 (743 nm) is…
A new kind of mixed-valence binuclear µ-oxo complex of manganese having two aqua ligands has been synthesized and structurally characterized.
In recent years, due to improvements in calculation methods and increased computer power, it has become possible to perform first-principles investigations for 'simple' chemical reactions at surfaces. We have carried out such studies for the catalytic oxidation of CO at transition metal surfaces, in particular, at the…
To address the ferrimagnetic state of the ${\mathrm{Mn}}_{12}$ acetate matrix $[{\mathrm{Mn}}_{12}{\mathrm{O}}_{12}{(\mathrm{C}\mathrm{H}}_{3}{\mathrm{C}\mathrm{O}\mathrm{O})}_{16}{(\mathrm{H}}_{2}{\mathrm{O})}_{4}]$ we have performed all-electron gradient-corrected density-functional calculations on $(\mathrm{MnO}{)}…
The synthesis of 4,4′-bis(dialkylaminostyryl)-6,6′-dimethyl-2,2′-bipyridine ligands is described; the corresponding tetrahedral bis(bipyridyl) copper(I) complexes have been prepared, and their second-order nonlinear optical properties determined by harmonic light scattering (HLS) at 1.34 µm; these new octupolar comple…
Cotton and polyester fabrics are treated with radio-frequency plasma (in air) at different power levels and time intervals, and moisture content and surface resistivity behavior are investigated. Plasma treatment lowers the moisture content of cotton and enhances that of polyester. The surface resistivity of plasma tr…
Thin stainless steel films were prepared by sputter deposition onto silicon substrates using a 304 stainless steel target. The film composition was essentially that of 304 stainless steel, but they had a body‐centered cubic structure and were free of sulfide inclusions. Potentiodynamic polarization curves were obtaine…
Despite much debate, there is still little consensus of opinion on the dependence of Zener pinning (the stagnation of grain growth caused by second-phase particles) on the volume fraction. The controversy surrounds attempts to relate the volume fraction of particles to the final pinned grain size. Analytical theories…
This paper focuses on the features that set apart the electron probe microanalysis (EPMA) of highly radioactive material from standard EPMA. In addition, it describes the difficulties encountered in the analysis of irradiated nuclear fuel and explains how certain problems have been solved or at least overcome. The pap…
The synthesis of perovskite-type LaCrO3 under mild hydrothermal conditions is reported. The synthesized product was characterized by means of XRD, IR, SEM and elemental analysis. The results indicated that the phase corresponded to orthorhombic perovskite-type LaCrO3, and the product had a narrow particle size distrib…
The synthesis of CdS nanocrystals has been carried out from the thermolysis in a dynamic vacuum, between 150 and 300 °C, of the novel asymmetric cadmium dithiocarbamate [Cd{S2CNMe(C18H37)}2]; the particles ‘self cap’ during preparation; different size nanocrystals were synthesised, at different temperatures, and there…
Reaction of porphyrin-2,3-diones with aromatic aldehydes and NH4OAc in AcOH–CHCl3 affords 2-aryl-1H-imidazo[4,5-b]porphyrins which, with appropriate substitution, are useful building blocks for the synthesis of multi-porphyrin arrays; porphyrin-tetraones are similarly converted into the corresponding bis-fused systems.
Aluminium and gallium fluoroalkoxide complexes of formula M(OR f ) 3 (HNMe 2 ) [M=Al or Ga; R f =CH(CF 3 ) 2 , CMe 2 (CF 3 ) or CMe(CF 3 ) 2 ] were prepared by reacting the corresponding metal dimethylamide complexes with fluorinated alcohols. The dimethylamine adducts reacted with 4-dimethylaminopyridine to give M(OR…
We report the effect of varying the experimental conditions on the synthesis of colloidal HgTe nanocrystals in aqueous solution, and by using deuterated water (D2O) as a solvent, demonstrate strong luminescence over the full range of the strategic 1.3 and 1.5 µm telecoms windows.
The structure of orthorhombic hen egg-white lysozyme (HEWL) crystallized at 310 K has been refined at 1.7 A resolution. Large displacements of the side-chain atoms with respect to the tetragonal structure were observed in many places, in contrast to small displacements of the main-chain atoms. A chloride-ion binding s…
The destructive adsorption of CCl4 on La2O3 and CeO2 in the absence of any oxidant, such as oxygen, has been studied by X-ray photoelectron spectroscopy and insitu Raman spectroscopy as a function of the reaction temperature and the amount of CCl4 injected. La2O3 was much more reactive than CeO2, and CCl4 destruction…
The ability of CH3 groups to form helical chains of C–H‥π interactions with phenyl rings leads to polar stacking of trigonal octupolar networks in a substituted triazine, and therefore to three-dimensional non-centrosymmetry.
This paper is devoted to the study of resonant waveguide grating filters. It is shown that doubly periodic structures permit one to increase the angular tolerance of the filters without modifying the frequency linewidth. A theoretical study of such structures is presented and their response to an incident Gaussian bea…