Materials Literature
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The diffusive behavior of ethane and ethylene in single-walled carbon nanotubes is investigated using classical molecular dynamics simulations and density functional theory calculations. At low molecular densities, these nonspherical molecules follow a spiral path inside nanotubes with diameters of 13-22 A, which maxi…
Abstract 2,6-Di-tert-butylphenol is selectively transformed to 3,3′,5,5′-tetra-tert-butyl-4,4′-diphenoquinone in the presence of molecular oxygen using alkali-promoted Cu–Mg–Al hydrotalcites as recyclable heterogeneous catalysts.
Seven gadolinium complexes are shown to be excellent compounds for the preparation of heavy-atom derivatives for macromolecular crystallography projects. De novo phasing has been carried out using single-wavelength anomalous diffraction (SAD) on a series of gadolinium-derivative crystals of two proteins: hen egg-white…
The copolymerization of tert -butyl methacrylate (1) was carried out with the N -alkyl methacrylamides, e.g., N -octyl methacrylamide (2), N -ethyl methacrylamide (3), N -cyclohexyl methacrylamide (4), N -benzyl methacrylamide (5), and methacrylamide (6) . Thermal treatment of these copolymers leads to thermal syn eli…
A bis(radical) derivative based on a triphenylphosphane core substituted by two nitronyl nitroxide units is reported. This compound was isolated in two forms. One consists of an H2O adduct where H2O is hydrogen-bonded to the radical units, whereas the second lacks this bridging unit. Magnetic studies revealed that the…
The self-assembled supramolecular nanostructures of a bolaamphiphilic diacid, 1,20-octadecanedicarboxylic acid (ODA), on the subphase containing various metal ions have been investigated. Different from the bolaamphiphilic acid on pure water surface, exotic nanostructures were observed for the spreading Langmuir film…
Improved data quality now makes it feasible to exploit the weak anomalous signal derived only from the sulfurs inherent to the protein or in particular from halide ions incorporated by soaking. The latter technique requires the location of a high number of partially occupied halide sites. This number appears to be rou…
A new method of protein crystallization, the floating-drop vapour-diffusion technique, has been developed. The method combines the traditional sitting-drop vapour-diffusion technique and a novel two-liquid system. A crystallization drop composed of a mixture of sample and reagent floats on an insoluble and very dense…
A three-way model catalyst has been prepared with 0.58 wt % Pt on Ce 0.68 Zr 0.32 O 2 mixed oxide washcoated on a ceramic monolith. Conditions of the washcoating procedure, i.e., powder size distribution and acidic nature of the slurry, have been optimized. The activity on simultaneous elimination of NO, C 3 H 6, and…
A series of perfluoroalkyl end-capped poly(ethylene oxide) (PEO) of molecular weight M n = 10 000 and 20 000, noted F-HEUR-10K and F-HEUR-20K, with a well-defined structure were synthesized in two reaction steps. The reaction of PEO with a large excess of isophorone diisocyanate (IPDI) leads to an isocyanate-terminate…
A novel liquid crystalline quaternary five-block molecule is reported which is composed of four incompatible molecular parts, a rigid biphenyl core, two polar 2,3-dihydroxypropoxy groups in the terminal 4- and 4'-positions, and a branched semiperfluorinated chain in the lateral 3-position, consisting of a perfluorinat…
Layer-by-layer (LBL) films of a semiconducting polymer (POMA) alternated with a polyelectrolyte (PVS), adsorbed onto silicon oxide, mica, ITO/glass, Au/Cr/glass, hydrophilic and hydrophobic glass were studied by atomic force microscopy (AFM). The samples were characterized LBL with the AFM operating in the contact, fr…
Abstract Liquid propylene was polymerized in a 5‐L autoclave batch reactor using a commercially available TiCl 4 /MgCl 2 /Al(ethyl) 3 /DCPDMS Ziegler–Natta catalyst, with a phthalate ester as internal electron donor. The powders from these polymerizations were characterized using laser diffraction particle size distri…
Abstract Molecular distortion of a photoexcited diplatinum(II) complex in a single crystal has been directly observed by accurate synchrotron radiation diffraction studies. Photoexcited crystallographic analysis has revealed that a small portion of [Pt2(pop)4]4− (pop = H2O5P22−) complex shows the Pt–Pt bond shrinkage…
Abstract In a previous investigation, we observed that in the presence of a conventional vulcanization system, the addition of white rice husk ash (WRHA) to natural rubber (NR) compounds increased the rate of crosslinking and lowered the apparent activation energy ( E a ) of the vulcanization reaction more strongly th…
Yeast hypothetical protein YBL036C (SWISS-PROT P38197), initially thought to be a member of an 11-protein family, was selected for crystal structure determination since no structural or functional information was available. The structure has been determined independently by MIR and MAD methods to 2.0 A resolution. The…
Designed coiled-coil heterotrimers are described whose assembly is governed by both hydrophobic and hydrophilic forces. Sterically matched hydrophobic core side-chain packing of alanine and cyclohexylalanine has been shown to promote formation of a 1:1:1 heterotrimer. Manipulation of hydrophilic glutamic acid (Glu)/ly…
The adsorption and intercalation of the cationic luminescence probe, tris(2,2‘-bipyridine)ruthenium(II) complex ([Ru(bpy) 3 ] 2+ or Rubpy), into hectorite and Laponite host clay films were investigated. Because the photophysical properties of Rubpy are strongly influenced by the lamellar nanospace of the smectite host…
The electric conductance of the graphite ribbon with locally applied gate voltage has been studied in terms of the Landauer approach. In the low-energy region, nano-graphite ribbon with zigzag boundaries exhibits the single electronic transport channel due to the edge states. The chemical potential dependence of the e…
A new synthesis procedure has been developed for a series of maleimide-based fluorophores, exhibiting a large variation of emission spectra spanning the entire visible range.