Materials Literature
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Amyloid bodies can be found in mammary secretory tissue of various species. These corpora amylacea (CA) have a lamellated structure, contain amyloid fibrils and are predominantly located in the alveolar lumina. The nature of the amyloid was not known, but CA were suggested to originate either from milk casein or mamma…
Micromagnetic calculation using a discrete model was applied to computer simulation of the magnetic properties of nanocomposite magnets, and the effect of the strength of the intergrain exchange interaction on magnetic properties was studied. A reduction of the strength of the intergrain exchange interaction suppresse…
Octadentate N5O3 ligands containing a coordinating pyridyl group form kinetically stable complexes with Eu and Gd that resist protonation; the structure of a representative Gd complex reveals a short Gd–Npy bond [2.535(1) Å], and the water exchange rate (kex298=2.7×106 s-1) is sufficiently fast so as not to limit the…
Reactions of an excess of Ln[N(SiMe3)2]3·x[LiCl(THF)3], generated in situ from the reaction of anhydrous LnCl3 with 3 equivalents of Li[N(SiMe3)2] in tetrahydrofuran, with 5,10,15,20-tetrakis(p-methoxyphenyl)porphyrin (H2TMPP) in refluxing tetrahydrofuran–bis(2-methoxyethyl) ether solution (1∶6 v/v) gave the cationic…
In this article, we will review a number of methods used to estimate the solubility in a wide variety of solvents. These methods can help in putting together a list of candidate solvents to test in the laboratory. To illustrate the utility and limitations of these methods, we will discuss how to use them to identify c…
The flow and heat transfer in the end region of a TEFC motor fitted with a 2-pole high-voltage winding have been predicted and measured in a full-scale model replicating the internal geometry. The work reported here examined the response of the flow and heat transfer coefficients to changes in the wafter size and numb…
The tetranuclear complex [Cu4(L)4(H2O)8][ClO4]4·2H2O (HL = 1,3-dimethylvioluric acid, i.e. 1,3-dimethyl-5-(hydroxyimino)-2,4,6(1H,3H,5H)-pyrimidinetrione) has been prepared and its crystal structure determined by X-ray diffraction methods. The structure consists of a tetranuclear cation [Cu4(L)4(H2O)8]4+, four non-co-…
Electrocrystallization of three hydroxylated donor molecules derived from tetrathiafulvalene (TTF) or ethylenedithiotetrathiafulvalene (EDT-TTF), i.e. Me3TTF-CH2OH, EDT-TTF(CH2OH)2 and TTF(CH2OH)4, in the presence of [n-Bu4N+]2[Mo6O19]2– afforded 2∶1 cation radical salts, [donor+˙]2[Mo6O19]2–, whose crystal structures…
The hole transport properties of ester substituted hexaalkyloxytriphenylenes are investigated and compared with the materials without ester substituents. The high hole mobilities of the recently investigated discotic liquid crystals of the hexaalkyloxytriphenylene-type are restricted to the very small temperature rang…
The catalysis of Cu-exchanged zeolite for the direct decomposition of nitric oxide was investigated by hybrid density functional theory (B3LYP) using a molecular model of the active site. For reactions of two NO molecules over a Cu ion bound to the zeolite model (ZCu), the structures and energies of adsorption complex…
A novel regioregular polymer comprising alternating 1,4-phenylene and 3-butyl-2,5-thienylene repeat units has been synthesized and characterized using 1 H NMR, FTIR, UV-VIS absorption and fluorescence emission spectroscopy. The derived polymer showed strong fluorescence with a solution quantum yield of 48% relative to…
The synthesis of novel perfluorovinyl thioacetoxy monomer (FSAc) and its copolymerization with vinylidene fluoride (VDF; also called 1,1-difluoroethylene) are presented. This monomer was obtained in good yield from the photochemical addition of thiol acetic acid to 1,1,2-trifiuoro-1,4-pentadiene. It was first hydrolyz…
Molecular dynamics simulations of the perovskite oxide KNbO 3 are performed with a first-principles effective Hamiltonian. They reveal the prevalence of local polar distortions with short-range chain-like correlations, present even in the paraelectric phase far above T c . The ordering of these dynamically fluctuating…
Several sets of non-standard zero-field splitting (ZFS) parameters in the spin Hamiltonian (SH) for transition-metal ions at orthorhombic or lower symmetry sites in various crystals have been revealed by a recent literature survey. The standardization limits the ratio of the orthorhombic ZFS parameters: (conventional)…
This paper describes a spectroscopic study of the heterogenisation of a novel liquid-phase epoxidation catalyst, a titanium(IV) silsesquioxane complex. Its immobilisation is performed exclusively via a straightforward adsorption of the homogeneous catalyst, i.e. the metal complex, in the pores of an MCM-41 host materi…
Penicillin G acylase is an important enzyme in the commercial production of semisynthetic penicillins used to combat bacterial infections. Mutant strains of Providencia rettgeri were generated from wild-type cultures subjected to nutritional selective pressure. One such mutant, Bro1, was able to use 6-bromohexanamide…
The reaction of an aqueous solution of sodium molybdate with hypophosphorous (phosphinic) acid acting both as reducing agent and ligand at low pH values (≈1) results in the formation of nanosized ring-shaped cluster units which assemble to form layers of the compound Na21[MoVI126- MoV28O462H14(H2O)54(H2PO2)7]·xH2O 1 (…
This paper deals with discontinuous pollution layers deposited on the insulator surface. Two zones are known to form: a clean (dry) zone and a polluted (wetted) zone. The influence of the length and position of the dry zone on the leakage current and the arc length are investigated. These were made on a plane experime…
Perfluoroheptadecan-9-one is a selective and mild catalyst for the epoxidation of a wide variety of alkenes with hydrogen peroxide; after the reaction the catalyst can be easily recovered and reused without noticable decomposition.
Hetrogenisation of H3PW12O40 and (nBu4N)4W10O32 with silica provides new photocatalytic systems able to oxygenate cyclohexane with O2 without causing the oxidative mineralization process which typically occur on the surface of the photosensitive semiconductor TiO2.