Materials Literature
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The reaction of [Ni(cyclam)](PF6)2 with K2CrO4 in water gave a chromato-bridged one-dimensional complex, catena-(μ-CrO4-O,O‘)[Ni(cyclam)]. In the complex, an intrachain ferromagnetic interaction is operative through the chromate bridges. The magnetic interaction was discussed in terms of the orbital topology of the fr…
Water-distilled volatiles from the leaves of Eryngium foetidum L. of Cuban origin were analyzed by a combination of GC and GC/MS. Forty-six components were identified, of which the major ones were found to be 2,4,5-trimethylbenzaldehyde (20.53%), hexadecanoic acid (12.05%) and carotol (9.94%).
Macromolecular conjugates of dextran and diethylenetriaminepentaacetic acid (DTPA), aimed to complex gadolinium, were synthesized to obtain contrast agents for nuclear magnetic resonance imaging with good paramagnetic properties and long intravascular persistence. These conjugates were prepared from dextran 40 (Mn = 3…
Continuous‐carbon‐fiber‐reinforced silicon carbide composites (C/SiC) were prepared by chemical vapor infiltration in which the preforms were fabricated with the three‐dimensional braid method. The mechanical properties and microstructures were investigated. For the composites with no interfacial layer, flexural stren…
Abstract Graft copolymers of poly(ethylene glycol) (PEG) on a chitosan backbone (PEG‐g‐chitosan) have been synthesized and their aqueous solution properties were investigated. At pH 6.5 the graft copolymers are 100% soluble, while chitosan phase separates from solution at those conditions. These interesting graft copo…
In contrast to numerical methods for beam shaping, analytical beam shaping consists of two steps: first, finding a purely geometrical distortion between the input plane and the output plane redistributing the intensity of the incoming wave front; and, second, computing a phase-only element realizing this coordinate tr…
Structures of Pt species derived from Pt 4 (μ-CH 3 COO) 8 on an α-Al 2 O 3 (0001) single-crystal surface were studied by means of in-situ polarization-dependent total reflection fluorescence XAFS (EXAFS and XANES) techniques. The Pt 4 cluster framework was destroyed upon the deposition of Pt 4 (μ-CH 3 COO) 8 by the re…
The kinetics of grain growth and Ostwald ripening in Al 2 O 3 ‐ZrO 2 two‐phase composites was systematically investigated using two‐dimensional (2‐D) computer simulations, based on a diffuse‐interface field model. Using average values for the experimentally measured ratios of the grain boundary energies to the interph…
A polyisoprene- block -poly(2-cinnamoyethyl methacrylate) (PI- b -PCEMA) sample with a narrow molar mass distribution was prepared and characterized. The sample formed spherical micelles in hexanes/THF with 20% of THF by volume. After photo-cross-linking of the PCEMA core took place, the PI corona block was cleft by o…
We present surface force data on three different polystyrene/poly(2-vinylpyridine) block copolymers (PS/P2VP) with a fixed size of the nonadsorbing PS block but widely varying sizes of the adsorbing P2VP block. With respect to the sizes of the two blocks, they range from moderately to highly asymmetric. The equilibriu…
Carbohydrates are often key components in the formulation of extrusion pastes, yet the reasons for selection are presently empirical. The influence on paste extrusion of various types of carbohydrates, such as starch, dextrin, lactose, and glucose, have been studied and related to their water retention capacities. The…
The dinuclear Ru(III) complexes trans-[{(NH(3))(4)Ru(py)}(2)(&mgr;-L)][PF(6)](4), where py represents pyridine and L represents 1,4-dicyanamidobenzene dianion (dicyd(2)(-)) derivatives dicyd(2)(-) (1), Me(2)dicyd(2)(-) (2), Cl(2)dicyd(2)(-) (3), and Cl(4)dicyd(2)(-) (4), have been prepared and characterized by electro…
A new quaternary rare-earth sulfide has been isolated and identified. Crystals of La6MgGe2S14, as well as of the previously identified La6MgSi2S14have been grown from a mixed binary-halide eutectic flux. They both crystallize in the hexagonal space groupC66-P63, withZ=1. The crystal structures of these compounds have…
Formation of ternary complexes between Gd-DTPA, Gd-DTPA-BMA, and Gd-DOTA, used as contrast enhancement agents in MRI and the endogenously available carbonate and phosphate ions, has been demonstrated. The extent of ternary complex formation and its effect on the proton relaxation, measured at 9 MHz, rates is negligibl…
Various bacteria are able to grow aerobically or anaerobically on malonate as sole source of carbon and energy. Independent of the mechanism for energy conservation, the decarboxylation of malonate is the key reaction in the decomposition of this compound. To achieve malonate decarboxylation under physiological condit…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTNew Metalloporphyrins with Extremely Altered Redox Properties: Synthesis, Structure, and Facile Reduction to Air-Stable π-Anion Radicals of Zinc and Nickel β-HeptanitroporphyrinsKarine Ozette, Philippe Leduc, Magali Palacio, Jean-Francois Bartoli, Kathleen M. Barkigia,…
We report the ab initio structure solutions of C(6)H(5)OM (M = K, Rb, Cs) by high-resolution powder X-ray diffraction. The compounds, which are of interest for reactions of the Kolbe-Schmitt type, are isostructural. The crystal structures are orthorhombic, space group Pna2(1), Z = 12, with lattice parameters (a, b, c…
Abstract A systematic method is presented to synthesize reactive crystallization processes. It shows how to selectively crystallize a desired solid product(s) after a reaction step and how to use compound formation to effect separation of a mixture. The method is based on the generation of phase diagrams with liquid‐p…
Dithiolium salts, with amphipathic character, are compounds of choice for investigations of the influence of an ionic feature upon mesomorphic properties. In this way, salts bearing a branched chain have been studied by SAXS. In spite of their rod-like shape, they exhibit only columnar mesophases, the supramolecular o…
Phosphor thin films of ZnS:Mn on Si(100) have been subject to electron bombardment (0.6–4 keV) over a range of pressures from 1×10−6 to 5×10−8 Torr. Various gases including hydrogen, oxygen, and water vapor were introduced into the ambient during bombardment, to assess their effects on the phosphor surface. Auger elec…