Materials Literature
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The 23 Na and 29 Si NMR spectra of the sodium−silicon clathrate materials Na 8 Si 46 and Na x Si 136 (1 < x < 24) and the parent Zintl phase NaSi have been studied in detail with a view to ironing out a number of ambiguities in the published literature and to determining properties of these potential thermoelectric ma…
Copper(II) azide complexes of three tridentate ligands namely 2,6-(3,5-dimethylpyrazol-1-ylmethyl)pyridine (L), 2,6-(pyrazol-1-ylmethyl)pyridine (L'), and dipropylenetriamine (dpt) yield three kinds of complexes with different azide-binding modes. The ligand L forms two end-on-end (mu-1,3) diazido-bridged binuclear co…
A theoretical and computational study of the nitrogen superhyperfine structure in Cu(II) complexes is reported. The determination of hybridization parameters for nitrogen donor orbitals from the data is examined. For most Cu(II) complexes the results deviate substantially from pure “sp 2 ” or “sp 3 ” hybridization. Se…
The combination of small-angle X-ray scattering and qualitative porosimetry is applied to the puzzling phenomenon of overly large specific surface areas in some mesoporous silicas. Geometrical calculations, considering the relationship between structure, lattice parameter, and specific surface area, reveal the latter…
The homoleptic complexes [Ph(4)P](2)[Co[N(CN)(2)](4)] and [Ph(4)P][M[N(CN)(2)](3)] [M = Co, Mn] have been structurally as well as magnetically characterized. The complexes containing [M[N(CN)(2)](4)](2-) form 1-D chains, which are bridged via a common dicyanamide ligand in [M[N(CN)(2)](3)](-) to form a 2-D structure.…
Manganese oxide catalysts supported on Al 2 O 3, ZrO 2, TiO 2, and SiO 2 supports were used to study the effect of support on ozone decomposition kinetics. In-situ laser Raman spectroscopy, temperature-programmed oxygen desorption, surface area measurements, and extended and near-edge X-ray absorption fine structure (…
The synthesis of silver and gold metal nanospherical particles stabilized by the fourth-generation poly(amido amine) (G4 PAMAM) dendrimer is reported. The reduction of silver nitrate and sodium tetrachloroaurate in the presence of the PAMAM dendrimer having terminal amine groups results in the formation of stable, wat…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTHydroxylated Quantum Dots as Luminescent Probes for in Situ HybridizationSrikant Pathak, Soo-Kyung Choi, Norman Arnheim, and Mark E. ThompsonView Author Information Department of Chemistry and Molecular Biology Program University of Southern California Los Angeles, Cal…
The refractive index is a measure of how much light slows down when it enters a medium. Conventional materials have a positive refractive index that is normally greater than 1. In his Perspective, Wiltshire explains how Shelby et al. were able to defy convention and make a negative refractive index material without vi…
Recently, a variety of aliphatic polyesters have been synthesized using hydrolases such as lipases and PHB depolymerases, and the reaction mechanism for these enzyme-catalyzed polymerization has been discussed. In this paper, we have studied the involvement of the catalytic amino acid residues of the hydrolase in enzy…
The thermal decomposition of hydrotalcite-like materials containing Zn(II), Fe(III), and Al(III) is studied. One of these samples contains zinc and aluminum in the brucite-like layers, while iron is incorporated as hexacyanoferrate(III) anions in the interlayer space. A second set of samples with Fe/Al atomic ratios i…
Theoretical calculations of 17 O and 14 N nuclear quadrupole coupling (NQC) constants (χ) and asymmetry parameters (η) for small α-helix and β-sheet protein fragments have been carried out using the density functional theory. This computational study is intended to shed light on the differences between the two major s…
We report on the transport properties, Hall effect and resistivity, of epitaxial ${\mathrm{La}}_{1\ensuremath{-}y}{\mathrm{TiO}}_{3+\ensuremath{\delta}}$ thin films. The materials, grown by molecular beam epitaxy, display a temperature independent Hall coefficient and a characteristic ${T}^{2}$ dependence of the resis…
Boride material is said as the useful material, which has high melting point and high strength. B<SUB>4</SUB>C in carbide is very hard at the next of the diamond and cubic-BN in the Mohs hardness and B<SUB>4</SUB>C has excellent chemical stability and high strength. B<SUB>4</SUB>C is being used as the polishing materi…
Catalyzed by styrene-divinylbenzene copolymer (SDB)-supported Pd (Pd/SDB) catalysts, ethyl acetate can be formed from water-containing ethanol via concomitant partial oxidation and esterification reaction. The partial oxidation reaction is carried out over palladium clusters on the catalysts. The esterification reacti…
ADVERTISEMENT RETURN TO ISSUEPREVNoteNEXTA Preparation Method of Thermoreversible Poly(vinyl chloride) GelsYuji AokiView Author Information Chemical Science Laboratories, Mitsubishi Chemical Corporation, 1, Toho-cho, Yokkaichi, Mie 510-8530, Japan Cite this: Macromolecules 2001, 34, 10, 3500–3502Publication Date (Web)…
Polarized micro-Raman experiments were performed on samples of aligned single-wall carbon nanotubes (SWNTs) previously characterized by scanning electron microscopy. The analysis of the different spectral shapes of the tangential G band, when the position of the laser beam changes from spot to spot on the sample, allo…
Ab initio molecular orbital calculations have been carried out for silicate, aluminosilicate, and aluminate clusters to study the NMR characteristics of various types of hydroxyls (OH) that are possibly present in hydrous silicate glasses and melts. The clusters have been optimized with the density functional theory (…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTSecondary Bonding-Directed Self-Assembly of Amino Acid Derived Benziodazoles: Synthesis and Structure of Novel Hypervalent Iodine MacrocyclesViktor V. Zhdankin, Alexey E. Koposov, Jason T. Smart, Rik R. Tykwinski, Robert McDonald, and Angelina Morales-IzquierdoView Aut…
The complexes [(mu-bmtz(*-))[Cu(PPh(3))(2)](2)](BF(4)) (1) and [(mu-H(2)bmtz)[Cu(PPh(3))(2)](2)](BF(4))(2) (2) (bmtz = 3,6-bis(2'-pyrimidyl)-1,2,4,5-tetrazine and H(2)bmtz = 1,4-dihydro-3,6-bis(2'-pyrimidyl)-1,2,4,5-tetrazine) were obtained as stable materials that could be crystallized for structure determination. 1.…