Materials Literature
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Lanthanide complexes of three classes of polyoxoanions have been characterized by multinuclear ( 183 W and 31 P) NMR spectroscopy among other techniques. The tetrabutylammonium salt of the lacunary [α-2-P 2 W 17 O 61 ] 10- , prepared by metathesis of the potassium salt, was isomerically pure according to 183 W and 31…
The complexes [Ru{2-(CC)C5H3NR-5}(PPh3)2(η-C5H5)] (R = NO2 1 or H 2), [Ni{2-(CC)C5H3NR-5}(PPh3)(η-C5H5)] (R = NO2 3 or H 4) and [Au{2-(CC)C5H3NR-5}L] (L = PPh3, R = NO2 5 or H 6; L = PMe3, R = NO2 7) have been synthesized and 3, 5 and 6 structurally characterized; no significant increase in quinoidal vinylidene contri…
(La 0.8 Sr 0.2 ) 0.9 MnO 3 –YSZ composite particles were synthesized by spray pyrolysis. The mean particle size of the synthesized powders was about 1 pm and the particle size distribution was very narrow. The synthesized powders were composed of the perovskite (La,Sr)MnO 3 and cubic phase YSZ. Each particle synthesiz…
A simple method for the preparation of stable colloidal suspensions of gold nanoparticles in silicate sols, silicate based films and monoliths is presented; organically modified sol–gel monomers containing amine functional groups are used for the stabilisation of Au ions and the metal nanocrystalline sol.
Surface modification of Kapton polyimide film (325 nm thick) by means of chromic acid and perchloric acid at different times and temperatures has been carried out. The contact angle of water decreased from 82 to 55° and the surface energy increased accordingly from 26 to 45 mJ/m2 with times of etching by chromic acid…
Reaction of ligand 2 with CuI ions leads to the self-assembly of the distorted [2 × 2] grid complex 1 of box-like shape, featuring a well defined cavity and trapping of guest molecules.
Adsorption isotherms of nitrogen at 77 K and carbon tetrachloride at temperatures between 273 and 323 K have been determined on the pure silica form of MCM-41 of pore diameter ca. 3.4 nm. The nitrogen isotherm is of a reversible type IV in the IUPAC classification and shows a first-order change in the physisorption me…
The dynamics of the photoinduced cyclization reaction of furyl fulgides has been studied applying femtosecond time-resolved transient absorption spectroscopy. For furyl fulgide 1 and adamantylidene-substituted furyl fulgide 2 in different solvents, a scheme of the reaction mechanism is set up and the reaction rates ar…
We have succeeded in controlling magnetic properties such as the saturation magnetization, the Weiss temperature and the coercive field using compounds in the series (NiIIxMnII1-x)1.5[CrIII(CN)6], by the strategy of choosing both ferromagnetic (J > 0) and antiferromagnetic (J < 0) exchange interactions by using the ap…
Novel soluble unsymmetrical metallophthalocyanines with twelve 2,2,2-trifluoroethoxy groups as donor substituents and a mono-nitro or an exocyclic conjugated nitro group as an acceptor substituent have been synthesized and characterized. A study of the concentration dependence of UV–VIS absorption spectra showed they…
Nebulized spray pyrolysis of metal–organic precursors in methanol solution has been employed to prepare powders of TiO 2 , ZrO 2 and PbZr 0.5 Ti 0.5 O 3 (PZT). This process ensures complete decomposition of the precursors at relatively low temperatures. The particles have been examined by scanning and transmission ele…
A new method to compare the oxygen buffering capacity (OBC) of catalysts shows that Ce–Tb mixed oxide presents an exceptional capability for attenuating fast oscillations of oxygen partial pressure.
Lanthanide complexes of two polydentate N-donor ligands containing a mixture of pyridyl and pyrazolyl donors have been prepared. Dihydrobis[3-(2-pyridyl)pyrazolyl]borate (L 1 ) - is a tetradentate ligand with two bidentate chelating pyridyl/pyrazolyl arms linked by an apical BH 2 group; 2,6-bis(1H-pyrazol-3-yl)pyridin…
The docking section of CASP2 is reviewed. Seven small molecule ligand–protein targets and one protein–protein target were available for predictions. Many of the small molecule ligand complexes involved serine proteases. Overall results for the small molecule targets were good, with at least one prediction for each tar…
Linear poly(tartrate ester) ligands provide high chemical yields and enantiomeric excesses in the epoxidation of trans-hex-2-en-1-ol using Ti(OPr i ) 4 –tert-butyl hydroperoxide.
ABSTRACT Biodegradable and edible films were prepared from three types of wheat flours: commercial bread, hard red winter, and soft white. Films were produced at two pH values (4 and 11) and tested for oxygen permeability as related to temperature. Films were also produced with a cross‐linked agent and tested for tens…
Tripyrrane dibenzyl esters are readily available from the reaction of two equivalents of 5-acetoxymethylpyrrole-2-carboxylates with 2,5-diunsubstituted pyrroles in refluxing acetic acid-ethanol. Hydrogenolysis of the benzyl ester moieties affords the corresponding dicarboxylic acids, and subsequent condensation with 2…
Raman spectra of oligo-p-phenylenes, oligorylenes, and oligoacenes of different chain lengths have been obtained in the solid state and in solution. Among the properties studied, particular attention is devoted to frequency and intensity dispersion of the Raman bands with increasing conjugation length and to the vibra…
1,7-dithia (12-crown-4)-bridged phthalocyanine network polymers were prepared from tetracyanodibenzo-[1,7-dithia(12-crown-4)]. In addition, the synthesis of two 1,7-dithia (12-crown-4) linked peripherally octa-substituted dimeric phthalocyanines, which contain a combination of hexakis(alkylthia) side chains, is descri…
New discusses the ways in which Canadian writing, through images of land and space, expresses various assumptions about social values. In addition to wide range of literary texts, he also draws upon geography, the social sciences, and the visual arts.