Materials Literature
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In-situ extended X-ray absorption fine structure (EXAFS), 1 H and Xe nuclear magnetic resonance (NMR), H 2 chemisorption, X-ray powder diffraction (XPD), and high-resolution electron microscopy (HREM) techniques were used to understand, as precisely as possible, carefully prepared Pt/Y zeolite samples at industrially…
A direct relationship between a generalized Fukui function and charge redistribution between states of different multiplicities is exploited to rationalize the stability of half-filled shells. This rationalization is in agreement with the idea introduced by Boyd (Boyd, R. J. Nature 1984, 310, 480) that Hund's rule is…
New segmented polyurethanes (SPUs) based on stearyl and phosphatidylcholine analogues were synthesized. The soft segments used in this study were the poly(butadiene) (PBD) glycol, the hard segments of these SPUs were composed of 4,4‘-methylenediphenyl diisocyanate (MDI), 2-[bis(2-hydroxyethyl)methylammonio]ethyl stear…
Two octadecanuclear clusters [Cu12Ln6(µ3-OH)24(O2CCH2CH2NC5H5)12(H2O)16(µ12-ClO4)][ClO4]17·16H2O (LnIII= GdIII or SmIII) have been synthesized and characterized by X-ray structural analysis. The clusters are isostructural, crystallizing in the triclinic space group P with Z= 1. In each structure six LnIII are position…
Detailed X-ray photoelectron spectroscopy analysis of sulfonated high-density polyethylene (HDPE) prepared by using a gaseous mixture of SO 3 + N 2 was carried out. It was shown that the surface contains, apart from sulfonic acid groups, sulfate, keto, and polyene linkages. The evolution of the different surface group…
The surface conditions of glassy carbon (GC) electrodes anodized in n-CnH2n+1OH (2=2, 4, 6, 8 : electrodes 1-4), HO(CH2)nOH (n=2-5 : electrodes 5-8), and HO(CH2CH2O)2CH2CH2OR (R=H, Me : electrodes 9 and 10) were explored by measuring the wettability and capacitance as well as the voltammetric response to Fe(CN)3-6;wet…
The 1 H NMR spectra of [YbH(tpp) 2 ] ( I ), [DyH(tpp) 2 ] ( II ), [YbH(oep)(tpp)] ( III ), and [DyH(oep)(tpp)] ( IV ), where tpp is tetraphenylporphyrin and oep is octaethylporphyrin, have been analyzed. The aim of this research is to set the limits of information which can be obtained through sophisticated NMR experi…
Solutions of polystyrene in DOP were studied as a function of the concentration (0.2−0.9 g/mL) and temperature (−10 to +130 °C) using static and dynamic light scattering. The concentration and temperature dependence of the cooperative diffusion coefficient and the osmotic modulus were determined. The concentration and…
The properties of new 2,2‘-ethanediylidene(1,3-dithiole) derivatives 5, 6, and 8 − 11 are reported. Cyclic voltammetric studies establish that they are efficient donor molecules, with the extended conjugation resulting in stabilization of dications, relative to tetrathiafulvalene TTF ( 1 ). Radical cations are generat…
Stepwise oxidation of tetrathiafulvalenyl(diphenyl)phosphine (1), 4′,5′-dimethyltetrathiafulvalen-4-yl(diphenyl)phosphine (1a), bis(tetrathiafulvalenyl)phenylphosphine (2), bis(4′,5′-dimethylt-tetrathiafulvalen-4-yl)phenylphosphine (2a), tris(tetrathiafulvalenyl)phosphine (3) and tris(4′, 5′-dimethyltetrathiafulvalen-…
The deformation of duplex structures in general and duplex stainless steels (DSS) in particular is very complex. The existence of the massive second phase leads to numerous unexpected features, i.e. the microstructure is the most decisive influence parameter on the deformation behavior of duplex structures. In the cas…
Part 1 Toughened thermosets: epoxy resins unsaturated polyester resins thermosetting polymides. Part 2 Toughened thermoplastics: nucleation processes in toughened plastics isotactic polypropylene based blends polyamide 6/ethylene-co-vinylacetate blends - a model system of thermoplastic/elastomer pairs blends polyamide…
In a continuing search for mixed-valence copper phosphate compounds, crystals of a novel copper(I/II) oxophosphate chloride, Na 2 Cu 4 P 2 O 9 Cl, have been grown in a low-temperature eutectic flux of 23% NaCl and 77% CuCl (mp = 315 °C). The title compound crystallizes in an orthorhombic lattice, Cmcm (No. 63), with a…
Two-arm poly(ethylene oxide) (PEO) fractions with different molecular weights (MWs) have been prepared. For each fraction, both arms have equal lengths of MW = 2300 or 5500. The MWs and molecular weight distributions of two-arm PEOs after fractionation are determined from vapor pressure osmometry, gel permeation chrom…
Aqueous solutions of methylcellulose (MC) were studied as a function of temperature. It is well known that semi-dilute MC solutions are forming a gel upon heating. The gelation phenomenon is time-dependent and reversible but with a hysteresis. Different cyclic thermal treatments were conducted characterizing the forma…
The effect of alkali metals, such as Na, added to silica-supported copper (Cu/SiO2) catalysts has been studied in the gas-phase catalytic oxidation of benzyl alcohol. The main products were benzaldehyde as a partial oxidation product and carbon dioxide as a complete oxidation product. The silica-supported copper catal…
A mechanism of transition metal silicide-catalysed hydrodehalogenation of silicon tetrachloride to trichlorosilane is proposed. The overall reaction includes electron transfer steps from the metal silicide catalyst to adsorbed silicon tetrachloride molecules. A silylene species (SiCl2), which is formed from SiCl4 and…
Abstract The irreversible adsorbates formed after exposure of platinum to an NO‐containing solution were studied with Differential Electrochemical Mass Spectrometry (DEMS), Fourier‐Transform Infrared Spectroscopy (FTIRS) and cyclic voltammetry. DEMS and FTIRS show that only a very small amount of N 2 O is formed in th…
The effect of reactive compatibilization on adhesion at the interface between the immiscible polymers polystyrene and poly(2-vinylpyridine) was investigated. Reactivity was incorporated into the system by lightly sulfonating the polystyrene component, providing acid functionality which is coreactive with the basic pyr…
ADVERTISEMENT RETURN TO ISSUEPREVNoteNEXTStepwise Synthesis of Substituted Dicyanotriazolehemiporphyrazines. A Regioselective Approach to Unsymmetrically Substituted Hemiporphyrazines†Gema de la Torre and Tomás TorresView Author Information Departamento de Química Orgánica (C-I), Universidad Autónoma de Madrid, E-2804…