Materials Literature
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Irradiation of the N−D stretching band in crystalline deuterium-doped ammonium copper Tutton salt rotates the ammonium ion and changes the conformation of molecules about the copper. The crystal salt exists in at least two different crystal forms, each form containing a particular Jahn−Teller distorted copper conforma…
Pressure swing NOx adsorption-desorption cycles were performed in the temperature range 200-350 degrees C using a fixed adsorbent bed of compressed Na-Y pellets and using a honeycomb coated with Na-Y powder. The experiments were performed using a synthetic gas mixture mimicking exhaust from a lean burn internal combus…
Abstract The crystallization kinetics of poly(ethylene oxide) (PEO) blocks in poly(ethylene oxide)‐ block ‐poly(1,4‐butadiene) (PEO‐ b ‐PB)/poly(1,4‐butadiene) (PB) blends were previously found to display a one‐to‐one correlation with the microdomain morphology. The distinct correlation was postulated to stem from the…
Gold(III) porphyrin 1 is shown to undergo reduction at the central metal ion to give the first known gold(II) porphyrin overturning the long held assumption that reduction of such complexes only occurs at the macrocycle.
The low temperature photoluminescence spectrum of InP nanocrystals (NCs) is composed of a near band-edge exciton and a defect emission band at lower energies. The present study characterized the defect emission utilizing an optically detected magnetic resonance spectroscopy (ODMR) both in continuous-wave and time-reso…
Similar to the classical β turn: An intramolecular cyclic 10-atom motif is defined in the molecular conformation of Piv-lPro-γ-Abu-NHMe (see powder X-ray diffraction structure; Piv: pivaloyl, Lpro: L-proline, γ-Abu: γ-aminobutyric acid) by a C−H⋅⋅⋅O interaction. This study emphasizes the considerable potential of powd…
Chemical modification of the buried interfaces between silicon wafers and either polystyrene or poly(methyl methacrylate) (PMMA) with the reagent (tridecafluoro-1,1,2,2-tetrahydrooctyl)dimethylchlorosilane (FDCS) was studied using liquid and supercritical carbon dioxide as the solvent and infusing agent. Above the cri…
We calculated the effect of varying the length of a metal-semiconductor carbon nanotube junction on its electrical properties. Joining a metallic (5,5) tube to a semiconducting (10,0) tube leads to the creation of new states near the Fermi energy and produces a larger conductance gap (about 2 eV) than the band gap of…
We report the formation of monomeric and J-aggregated 1,1‘-diethyl-3,3‘-di(4-sulfobutyl)-5,5‘,6,6‘-tetrachlorobenzimidazolocarbocyanine (referred to as TDBC) encapsulated within a silicate mesostructure, specifically SBA-15, under different pH conditions. To facilitate incorporation of TDBC, it was necessary to functi…
Trivalent europium or erbium doped yttria samples obtained by a wet chemical synthesis procedure have been investigated by wide and small angle X-ray scattering, scanning and transmission electron microscopy and luminescence spectroscopy. On the micron scale the powders obtained are large, compact aggregates built up…
Photoluminescent organic–inorganic composite films incorporating the rare-earth-containing polyoxometalate Na9[EuW10O36] (EW) and poly(allylamine hydrochloride) (PAH) have been prepared by the layer-by-layer self-assembly method. UV-vis spectroscopy and ellipsometry were used to follow the fabrication process of the E…
Abstract The structure of nylon‐6 hybrids with synthetic or natural clays was investigated for melt‐pressed films with Fourier transform infrared spectroscopy, wide‐angle X‐ray diffraction, and differential scanning calorimetry in comparison with the nylon‐6 homopolymer. In contrast to the development of familiar α‐fo…
We report the use of X-ray photoelectron spectroscopy (XPS) to characterize the surface compositions of colloidal nanocomposite particles. Each nanocomposite was synthesized by (co)polymerizing 4-vinylpyridine in the presence of an ultrafine silica sol. Thus, nitrogen and silicon were utilized as unique elemental mark…
Novel cluster Ru chalcogenide materials Mo x Ru y Se z and Ru x Te y were studied in situ using EXAFS in the transmission mode during the oxygen reduction reaction. Reversible changes in the structure of the active center were revealed for the electrochemical reaction as a function of the applied electrode potential.…
Functionalization of γ-[SiW10O36]8− with the sulfanylalkylsilane HSC3H6Si(OMe)3 affords difunctionalized γ-[SiW10O36(HSC6H3Si)2O]4−, which on addition to colloidal solutions of gold nanoparticles (4–12 nm) forms a novel hybrid nanosystem (see schematic diagram).
We describe the synthesis of novel copolymers containing quinoline, benzene, and alkyne groups by a Pd-catalyzed Heck−Cassar−Sonogashira−Hagihara reaction. Direct iodination of quinoline by a mixture of iodine, potassium periodate, and sulfuric acid in chloroform gives 3,6-diiodoquinoline. 3,6-Diiodoquinoline was coup…
Big blue-walled tires: A diamagnetic blue 28-electron reduced species [MoMoO432H28(H2 O)58]12− ({Mo142}) was produced photochemically by the degradative self-assembly of [Mo36O112(H2O)16]8− ({Mo36}). The molybdenum blue photochemistry is not only suitable for the investigation of the mechanism of degradation self-asse…
Size-tunable CdS nanorods have been synthesized via the reaction at low temperature (25−65 °C) of air-insensitive inorganic precursors cadmium acetate and sodium sulfide in an aqueous phase with surfactant. Nonionic pluronic amphiphilic triblock copolymers, (EO) x (PO) y (EO) x, were employed as structure-directing ag…
Differential scanning calorimetry (DSC), atomic force microscopy (AFM), wide-angle X-ray scattering (WAXD), and solid-state (13)C NMR have been used to investigate the crystalline/amorphous structure and molecular mobility of biodegradable poly(butylene adipate-co-44 mol % butylene terephthalate) [P(BA-co-44 mol % BT)…
Two novel tetradecanuclear hydroxo-lanthanide complexes, formulated as Ln14(mu 4-OH)2(mu 3-OH)16(mu-eta 2-acac)8(eta 2-acac)16, Ln = Tb, 1; Eu, 2; acac = acetylacetonato, were synthesized and characterized by single-crystal X-ray diffraction, elemental analysis and phosphorescence spectroscopy.