Materials Literature
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The product of the reaction between [Ru(H2O)6]2+ and pressurized H2 in water is [Ru(H2O)5(H2)]2+ whose nature was unambiguously demonstrated by 1H and 17O NMR and which is the first characterized dihydrogen aqua complex.
ADVERTISEMENT RETURN TO ISSUEPREVNoteNEXTInteraction Strengths in Styrene−Diene Block Copolymers and Their Hydrogenated DerivativesJ. LaMonte Adams, Daniel J. Quiram, William W. Graessley, Richard A. Register, and Gary R. MarchandView Author Information Department of Chemical Engineering, Princeton University, Princet…
Zinc phthalocyanine tetrasulfonate (ZnPcS4), a potential photosensitizer for photodynamic therapy (PDT), has been studied using femtosecond laser spectroscopy. The excited-state dynamics in water have been found to be fast (< 80 ps) and dominated by intermolecular aggregation. Since the proposed mechanism for PDT is e…
The intercalation/exfoliation reactions of MoS2 and SnS2 yield lamellar colloids, which may be grown layer-by-layer on cationic surfaces by alternate adsorption of cationic clusters or polymers.
An optically transparent and electrically conductive surface layer has been obtained by hydrogen annealing a bulk single crystal of ZnGa 2 O 4 , where a band gap as wide as 4.0 eV has been calculated from the results of optical transmittance. The carriers are mainly generated from oxygen vacancies. The conductivity is…
Ultra-high molecular weight polyethylene (UHMWPE) fibers were subjected to oxygen plasma treatment in order to improve interfacial adhesion. The treated fibers were characterized by contact angle analysis, X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), atomic force microscopy (AFM), and me…
The grafting of dimethyl amino ethyl methacrylate (DMAEMA) onto styrene-butadiene-styrene triblock copolymer (SBS) membrane was subsequently conducted by UV-radiation induced graft copolymerization without degassing to obtain the SBS-g-DMAEMA copolymer membrane. The substituted amino groups on the SBS-g-DMAEMA graft c…
Novel copper exchanged silicoaluminophosphates of chabazite type catalyst have been prepared. Conventional techniques such as elemental analysis, X-ray diffraction, scanning electron microscopy, X-ray photoelectron spectroscopy, nitrogen sorption capacity (BET) have been employed for the characterization of the materi…
The crystal structures have been determined and magnetic properties investigated for four novel HgBr2 complexes with pyridyl-substituted ‘nitronyl nitroxides’, 4,4,5,5-tetramethyl-2-(4-pyridyl)-(L1), -2-(2-pyridyl)-(L2), -2-(3-pyridyl)-(L3) and -2-(6-methyl-2-pyridyl)-2-imidazoline N 1-oxyl N 3-oxide (L4). Complex 1,…
A novel blue luminescent diborate compound B2(µ-O)Et2(7-azain)2 (7-azain = 7-azaindole anion) is synthesized and characterized structurally; it emits a blue color at λmax = 422 nm in the solid and at λmax = 419 nm in solution and is stable under air as a solid.
X-Ray and optical techniques have been employed to probe the physical properties of six materials that exhibit various frustrated chiral smectic phases. The temperature dependent evolution of the layer spacing, measured by small angle X-ray diffraction, is discussed with respect to the molecular structures of the mate…
A variety of organic liquids can be immobilised using certain 4-tert-butyl-1-arylcyclohexanol derivatives (BACOl). Only the isomers with axial aryl groups are active as gelling agents. The BACOl–hydrocarbon systems have been characterised with respect to their rheological properties under shear. The gels are viscoelas…
Anisotropic networks, elastomers and gels exhibit piezoelectric, pyroelectric, ferroelectric and NLO properties of potential interest for use communication and processing technologies. The formation, properties and applications of such anisotropic, mainly liquid crystalline, networks are described. If some of the mole…
The relaxivity of [GdL1]3+ in aqueous solution has been studied as a function of temperature and magnetic field strength. The complex possesses a high relaxivity at pH 6 (12.8 mmol-1 s-1) that diminishes as successive water molecules are deprotonated, leading to a complex species whose relaxivity is typical of a purel…
Macromolecular conjugates of dextran 40 (Mn = 38 kg/mol, Mw = 43 kg/mol) and diethylenetriaminepentaacetic acid (DTPA), capable of complexing Gd3+, were synthesized in order to obtain contrast agents for nuclear magnetic resonance imaging, with long intravascular persistence. As already reported, relaxivity of these m…
5,10,15,20-Tetraphenyl-26,28-dioxasapphyrin (O2TPSH) and 5,10,15,20-tetraphenyl-26,28-dithiasapphyrin (S2TPSH), heteroanalogues of 5,10,15,20-tetraphenylsapphyrin (TPSH3) have been synthesised by condensation of the respective precursors, namely 2,5-bis(arylhydroxymethyl)furan or bis(arylhydroxymethyl)thiophene and py…
A new approach to the problem of the kinetic exchange for orbitally degenerate ions is developed. The constituent multielectron metal ions are assumed to be octahedrally coordinated, and strong crystal field scheme is employed, making it possible to take full advantage from the symmetry properties of the fermionic ope…
Extended x-ray absorption fine structure at the manganese $K$ edge has been used to study the first oxygen coordination shell at the manganese site as a function of temperature in mixed-valence perovskites. ${\mathrm{La}}_{1\ensuremath{-}x}{\mathrm{Ca}}_{x}{\mathrm{MnO}}_{3}$ ($x=0,$ 0.15, 0.33, 0.5, 0.66, and 1), ${\…
The kinetics of the lamellar→hexagonal→cubic transformations of mesoporous zirconia prepared by using a neutral organic amine as the amphiphile have been studied in phosphoric acid medium. The lamellar→hexagonal transformation is preceded by a loss of the template molecules and the hexagonal→cubic transformation proce…
The local electric fields on a semicontinuous metal film are shown to experience giant fluctuations in the visible and infrared spectral ranges when the dissipation in metallic grains is small. The field fluctuations result in strongly enhanced Raman scattering. The scattered local fields at the Stokes frequency are c…