Materials Literature
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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…
A series of copper(bis-β-diketonate) complexes are reported which display columnar liquid-crystal phases with a hexagonal disordered structure ( D hd ). The complexes do not have the disc-shape characteristic of most D hd materials, but produce a disc shape by forming dimers with 90 o rotations between nearest neighbo…
The surface-enhanced Raman spectrum of pyromellitic dianhydride (PMDA) on Cu(100) is reported; it is different from that previously reported for the Cu(111) surface. The spectra are sensitive to the incident laser polarization on both surfaces but in different ways. These observations are shown to be inconsistent with…
Circularly polarized luminescence (CPL) and total luminescence of Tb(III) and Eu(III) as substitutional replacements for iron in a series of Fe binding transferrins are reported. The measurement of the total emission intensity is a direct measure of binding of the lanthanide ions and illustrates that approximately 2 e…
It is shown that in unfilled polyester, and that filled with Al/sub 2/O/sub 3/, the conductivity is Ohmic at low field strengths and space charge limited (SCL) at high fields. With ZnO, however, its non-linear, semi-conducting characteristic changes the conductivity of the filled polyester at sufficiently high concent…
Silicon nitride was formed by nitriding acid-leached and pyrolyzed rice husk in a nitrogen atmosphere. The nitridation kinetics of the pyrolyzed husk pellet over a temperature range of 1473−1723 K were studied by a thermal gravimetric analysis (TGA) technique. The effects of gas flow rate, pellet size, pellet-forming…
Cationic, phosphine-ligated Pt−Au cluster compounds, [Pt(AuPPh 3 ) 8 ](NO 3 ) 2 ( 1 ) and [(PPh 3 )Pt(AuPPh 3 ) 6 ](NO 3 ) 2 ( 2 ), have been immobilized on silica and alumina supports. Characterization of the supported clusters by 31 P MAS NMR, IR, and UV−visible spectroscopy and study by chemisorption and temperatur…