Materials Literature
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Manganese (III) meso-tetrakis(p-sulfonatophenyl)-β-octabromoporphyrin supported on Amberlite IRA-400 [Mn(Br8TPPS)-Ad-400] is a robust and efficient catalyst for epoxidation of alkenes and hydroxylation of alkanes with sodium periodate at room temperature.
The redox reaction of silver acetate with [Ni6(CO)12]2− (2) in acetonitrile has afforded in low yields (≤10%) a close-packed silver–nickel carbonyl cluster: namely, the pseudo-Td [Ag16Ni24(CO)40]4− tetraanion (1) as the [PPh3Me]+ salt. This well-defined, dark brown bimetallic cluster, which is air-unstable and light-s…
Abstract To develop high‐quality electromagnetic interference (EMI) shielding materials, the effect of plasma pretreatment with various gases prior to Cu plating was investigated. Plasma treatment increased the surface roughness in the decreasing order of Ar > O 2 > NH 3 , but adhesion of the Cu layer on poly(et…
This paper presents a 35 Cl NMR and XRD study of the structure and dynamical behavior of ClO 4 - intercalated into the interlayers of Mg,Al and Li,Al layered double hydroxides (LDHs). The variable temperature and variable relative humidity (R.H.) 35 Cl NMR data show that for these phases ClO 4 - is rigidly held at low…
Absorption and fluorescence spectroscopies were used to study the adsorption of Rhodamine 3B (R3B) dye on Saponite (Sap) particles in aqueous suspensions. Fluorescence data confirmed that the R3B monomer can be adsorbed in the interlayer space and at the water/clay interface of the Sap tactoids. From the evolution of…
A palladium-substituted polyoxometalate having a Keggin structure, supported on γ-alumina or active carbon, was used as a catalyst precursor for catalytic hydrogenation. The catalyst system enabled fast hydrogenation of arenes at 30 bar H2 and 230 °C. Most interesting was the finding that arenes could be selectively r…
The possibility to improve the thermoelectric properties of the misfit layer cobaltite [Tl 1 - x Sr 2+ x - y Co y O 3 ][CoO 2 ] b 1 / b 2, either by increasing the Tl content or by substituting Bi or Tl, has been investigated. Using a direct synthesis method, it is shown that the Tl content in this oxide, written for…
We focus on chain organization of long and short block chains on lamellar microdomains developed in a series of binary mixtures denoted as as / s i, which are composed of a long asymmetric polystyrene- block -polyisoprene (SI) and one of three short symmetric SI's denoted respectively as as and s i ( i = 1, 2, 3). We…
For the first time a pH indicator that responds to two different external stimuli, i.e. pH and light, namely methyl orange, has been implemented in a dendrimer. Six generations (G0−G5) of methyl orange-functionalized poly(propyleneamine) dendrimers (“MO dendrimers”) have been synthesized and characterized using 1 H NM…
A new copper−antimony sulfide, [C 4 H 12 N 2 ] 0.5 [CuSb 6 S 10 ], has been hydrothermally synthesized from binary metal sulfides in the presence of triethylenetetramine and characterized by single-crystal X-ray diffraction, thermogravimetry, elemental analysis, and SQUID magnetometry. The product ( M r = 1158.72) cry…
Nano-scale textures of transparent and ultra water-repellent thin films are prepared by microwave plasma CVD (Figure) using trimethylmethoxysilane. Water-repellency of films deposited on glass, silicon and polymethylmethacrylate substrates are discussed in terms of their nanotextures, the control of which is crucial t…
Synthesis and properties of new pH-sensitive cholesteric polymer composites are described. Polymer composites, consisting of low molar mass liquid crystal and chiral molecules entrapped in the polymer network, responded to changes in the chemical environment by increasing the pitch of the cholesteric helix. Hydrogen b…
The ion exchange occurring between a poly(vinylferrocene) (PVF) film and the bathing solution during the oxidation−reduction process was studied by probe beam deflection (PBD) in aqueous and nonaqueous media. In nonaqueous media the results for different electrolyte salts indicate that anions are exchanged. In aqueous…
Abstract Low‐density polyethylene was modified to incorporate aniline moieties by reactive processing with 4‐aminobenzenesulfonyl azide. Under melt‐processing conditions, the loss of nitrogen produces a sulfonyl nitrene which, in the singlet state, interacts with the substrate primarily by C–H insertion. Polymeric ble…
Two novel silicate anions, a singly-substituted cubic octamer (double four-ring cage with a pendant orthosilicate group) and its dimeric counterpart (two octameric cages linked by a single siloxane bridge), are detected by 29Si NMR spectroscopy in concentrated tetraalkylammonium silicate solutions at the low alkalinit…
The Sicarid spider Loxosceles laeta spins broad but very thin ribbons of elastic silk that it uses to form a retreat and to capture prey. A structural investigation into this spider's silk and spinning apparatus shows that these ribbons are spun from a gland homologous to the major ampullate gland of orb web spiders.…
Structural and transport properties of Cs 8 Cd 4 Sn 42 are reported. Cs 8 Cd 4 Sn 42 has a thermal conductivity that is unusually low for a crystalline solid (1 W m - 1 K - 1 at room temperature). This low lattice thermal conductivity is associated with the rattling of cesium in the tetrakaidecahedral cavities, as ind…
Data on the use of electrochemically generated metal complex catalysts in organic synthesis are analysed, systematised and generalised. The considerable potential of organic electrochemistry is shown. Some electrochemical methods provide advantages in the synthesis of compounds where conventional chemical methods fail…
We present the first study of chirality from the UV to the IR region for a conducting polymer, thereby probing the motion of the metallic “free carriers.” Through study of chiral and achiral camphorsulfonic acid (CSA) doped polyaniline (PAN) films cast from different solvents ( m -cresol and chloroform) and correlatio…
The interface between the science and engineering of biology and materials is an area of growing interest. One of the goals of this field is to utilize biological synthesis and processing of polymers as a route to gain insight into topics such as molecular recognition, self-assembly and the formation of materials with…