Materials Literature
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The reaction between tetrathiafulvalene (TTF) and suitable arenediazonium salts leads to products arising from an ordered sequence of reactions featuring electron transfer, loss of nitrogen, radical cyclisation and nucleophilic substitution. The tetrathiafulvalenium salt 6 is shown to be an intermediate in the reactio…
The present study investigates the mechanics of roll formation between sliding bodies at elevated temperatures and humid conditions. Silicon is used as the model material for reciprocating linear sliding tests. The evolution of tribological rolls initially involves the rapid oxidation of silicon wear debris by water,…
Comprehensive x-ray-diffraction data and structure factor calculations are presented for oriented poly(3-octylthiophene) films intercalated by iodine vapor to ${\mathrm{I}}_{3}^{\mathrm{\ensuremath{-}}}$ concentrations of 0, 4, 14, 26, and 45 mol wt. % per octylthiophene monomer. These data reconfirm previous reports…
[MnOEP][A]{A=[TCNE]˙– and [C4(CN)6]˙–} have been isolated as extended 1D coordination polymers with trans-µ2-[A] bridging ligands with strong {A=[C4(CN)6]˙–} and weak {A =[TCNE]˙–} ferromagnetic coupling as evidenced from the fit of the magnetic susceptibility to the Curie-Weiss law (θ= 5.1 and 67.1 K, respectively);…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNovel Photosensitive Polyimide Precursor Based on Polyisoimide Using an Amine PhotogeneratorAmane Mochizuki, Tadashi Teranishi, and Mitsuru UedaCite this: Macromolecules 1995, 28, 1, 365–369Publication Date (Print):January 1, 1995Publication History Published online1 May 200…
Two series (4 and 5, each with three members) of a new family of metallomesogens have been synthesized starting from the bisimine ligands 1 and 2 and the dichloroplatinum compound 3. These one-pot reactions of 1 or 2 with 3 leading to 4a and 5a, respectively, give insights into possible self-assembly processes and con…
Six silicas, with different surface areas, pore sizes and pore volumes, have been surface modified with pyridine groups and used to support iron(III) 5, 10, 15, 20-tetra(2,6-dichlorophenyl)porphyrin (FeIIITDCPP) by ligation to the metal ion. Comparison of these materials (SiPy–FeIIITDCPP) as catalysts for the epoxidat…
Abstract The effects of physical aging on the failure behavior of a typical brittle polymer, polystyrene, have been studied. Properties examined were creep rupture lifetimes, fatigue lifetimes, and environmental stress cracking in ethanol. Fractured samples were examined both optically and by scanning electron microsc…
Abstract The precipitation of calcite from a calcium bicarbonate solution, similar in ionic strength to natural hardwaters, was observed in a series of experiments utilizing an automated culture apparatus. Seeded growth experiments, using calcite seed crystals, were performed at a range of phosphate concentrations to…
The potential compatabilities of various commonly used excipients with Indomethacin (IMC) were compared using differential scanning calorimetry (DSC). Some agents were found to have no solid state interaction whereas others showed major changes in the thermograms signifying possible interactions in the solid state. Th…
Treatment of TiCl4 with carboxylic acids RCO2H (R = C6F5, CH2C6F5, CH2OC6F5) yields a series of titanium oxo compounds; the X-ray molecular structure of [TiO(O2CC6F5)2] reveals an octameric unit and a unique 16-membered Ti8O8 ring, with two toluene molecules encapsulated above and below the ring in the molecular cavit…
The hexa-Schiff-base cryptand N[(CH2)2NCH(C6H4-m)CHN(CH2)2]3N L1 has been found to encapsulate a pair of AgI or CuI cations without hydrolytic attack on the imine bonds; a problem which is evident when the [CuII2(OH)]3+ assembly is incorporated. The structure of the dicopper complex of a singly ring-opened ligand, der…
Time-resolved phosphorescence spectra from the lowest electronic triplet of Pd(2-thpy)₂ (with 2-thpy⁻ = ortho-C-deprotonated form of 2-(2-thienyl)pyridine) (see the inset of Figure 2) are presented. The complex was isolated in a Shpol'skii matrix to obtain high resolution. The emitting triplet lies at 18418 ± 1 cm⁻¹ (…
Halide-supported octahedral clusters of zirconium - structural and bonding questions cluster and metal-metal bonded chains in molybdenum oxide systems chalcogenide cluster complexes of early transition metals alkoxide clusters in molybdenum and vanadium phosphate solids organophosphonate and organoarsonate complexes w…
Abstract Fatigue damage in two austenitic‐ferritic duplex stainless steels, with the structure of a natural composite and different levels of nitrogen content, was studied in low‐cycle fatigue. Both steels show initial cyclic hardening followed by softening and a long stabilisation period. The cyclic stress‐strain cur…
The manifestations of semiconductor depletion and depolarizing effects in switching and fatigue are studied and compared. It is shown that these effects play important but quite different roles in switching. The depletion effect strongly influences the values of the coercive field, Ec, and is responsible for its filmt…
The title ligand [L1]– forms 2:1 complexes [MIII(L1)2]+(M = Sm, U) in which the metal ions are in an icosahedral N12 coordination environment from the two interleaved hexadentate ligands.
An L-glutamate derivative having one carboxylic and two dodecylamide groups form highly-oriented aggregates in benzene, which interact with a cationic achiral dye to produce extremely strong exciton coupling around the absorption band of the dye.
Silver sulfadiazine cream has been a standard treatment for burns over the past two decades. Although many studies have described the phenomenon of silver absorption from burn wounds treated with silver sulfadiazine, they failed to examine the chemistry underlying the absorption process: Silver chloride was assumed to…
Poly(ethylene glycol)-coated liposomes were prepared with poly(oxyethylene) cholesteryl ethers (mPEG-Chol). PEG unit numbers tested were 50, 100 and 200, of which the average molecular weights (m) of PEG were 2200, 4400 and 8800, respectively. Properties of both PEG-coated liposomes and PEG-Chol molecules were investi…