Materials Literature
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The reaction of CuCl2·2H2O (or CuBr2) with benzoic acid and 1,4,7-trimethyl-1,4,7-triazacyclononane in CH3OH affords green crystals of [{LCuIICl}2(μ-benzoato)](ClO4) (1) or its bromo analog (2). The dinuclear mono(carboxylato)-bridged cations display weak intramolecular antiferromagnetic exchange coupling. An apparent…
Experiments with the continuous precipitation of calcium carbonate are reported in this study. Particle size distributions were measured on-line and interpreted by means of the simultaneous nucleation and the transformation models developed in part 1 of this sequence. Three regimes of precipitation are reported in thi…
Poly(methyl methacrylate)- block -poly(methacrylic acid) (PMMA- b -PMAA) with and without pyrene labels attached to the end of the PMAA block have been synthesized and characterized. These polymers formed micelles with PMAA as the core in ethyl acetate/methanol mixtures when the ethyl acetate volume fraction was highe…
Electromigration occurs along grain boundaries in polycrystalline thin-film conductors when the grain size is significantly larger than the conductor width. As circuit feature sizes have been reduced, microstructures have become near bamboo and alternate diffusion mechanisms must operate within the bamboo grains. In t…
An optically active polyarylene, ( R )- 3, has been prepared from the palladium-catalyzed Suzuki cross-coupling of an optically active binaphthyl molecule, ( R )-2,2‘-bis(hexyloxy)-1,1‘-binaphthyl-6,6‘-diboronic acid, ( R )- 2, with 1,4-dibromobenzene. GPC analysis of ( R )- 3 shows M w = 41 000 and M n = 20 000 (PDI…
The paper presents the results of an investigation on the electrical performance of artificially contaminated non-ceramic insulators as a function of resting time. Resting time is defined as the time interval between the application of contamination and start of testing. New (unaged), full scale, 69 kV non-ceramic ins…
The results of calculations aimed at providing a better understanding of how protein structural parameters affect 15 N nuclear magnetic resonance (NMR) chemical shifts, using ab initio quantum chemical methods, are reported. The results support previous empirical observations that the two backbone dihedral angles clos…
The electrochemical behavior of the 2,2‘-azinobis(3-ethylbenzothiazoline-6-sulfonate) (ABTS), a reversible redox probe, has been examined after it has been intercalated into the interlayer spacing of anionic clays (also called layered double hydroxides, LDH). The cyclic voltammetry response of [Zn-Cr-ABTS] and [Zn-Al-…
Chemical oxidation (silver tosylate, acetone, room temperature) of a non-mesomorphic persubstituted ferrocene derivative leads to the corresponding ferrocenium species which exhibits a smectic A phase (polarized optical microscopy, differential scanning calorimetry, X-ray diffraction).
The phase separation and the coarsening process of polymer mixtures with a thermotropic liquid crystalline polymer (LCP) as one component are investigated. The LCP used is a main-chain type copolyester X-7G, comprised of p -hydroxybenzoic acid (60 mol %) and ethylene terephthalate (40 mol %) units. The isotropic, tran…
Qualitative ab initio theory is used to compare the electronic structures of nickel dithiolate complexes and the monosulfinates arising from O2 oxidations. The results are used to examine the electronic factors involved in the reaction mechanism. The frontier molecular orbitals (FMOs) of the dithiolate complexes are d…
The effect of annealing in UHV on the topographic and electronic structure of the TiO 2 (110) surface was studied by scanning tunneling microscopy and spectroscopy. Different (1× n ) reconstructions with domain sizes of 5−10 nm were clearly identified in the crystallographic orientation [001]. Two other types of recon…
The monoglyme {CH 3 OCH 2 CH 2 OCH 3 } and diglyme {CH 3 O(CH 2 CH 2 O) 2 CH 3 } adducts of the gadolinium trishexafluoroacetylacetonate {Gd(hfa) 3 ·monoglyme ( 1 ) and Gd(hfa) 3 ·diglyme ( 2 )} have been synthesized and characterized by elemental analyses, mass spectrometry, and infrared spectroscopy. Single-crystal…
[Mn13O8(OEt)6(O2CPh)12] was prepared and its X-ray structure has been determined. It is the largest cluster in which there are three oxidation states of a given metal ion in one molecule. The core of the complex is a supercubane [MnIVMnIII6MnII6(μ5-O)6(μ3-O)2(μ3-OEt)6]12+. The magnetochemistry of the compound shows th…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTRigid-Rod Polyesters with Flexible Side Chains. 6. Appearance of Hexagonal Columnar Phase as a Consequence of Microsegregation of Aromatic Main Chains and Aliphatic Side ChainsJunji Watanabe, Nobuhiro Sekine, Tokihiro Nematsu, Masat…
Recent studies have suggested that hydride precipitation at the metal/oxide interface could play a detrimental role on the waterside corrosion rate. Nevertheless, the mechanism of that detrimental role is not completely understood, and two hypotheses were investigated to understand the mechanism that controls the role…
The liquid-crystal templating approach used for the synthesis of M41S mesostructured materials is extended to aluminophosphates; a variety of lamellar AIPO4 phases with d-spacing in the nanometer range are prepared in the presence of long-chain alkyl- or dimethylalkyl-amines.
Electrodeposition of CdSe from nonaqueous solutions is shown to produce epitaxial, 5 nm diameter quantum dots (QDs) on evaporated {111} Au substrate and diffraction-amorphous QDs on evaporated Pd substrate. The QDs were characterized using bright-field and dark-field transmission electron microscopy (TEM), high-resolu…
Electron exchange between ethene molecules is studied using quantum chemical ab initio methods in order to model interchain electron transfer (ET) in polyacetylene. The potential surface for the system is obtained with the distance between the carbon atoms in each molecule as independent variables. The reaction path,…
We report evidence of photoisomerization-induced changes in the optical thickness of molecularly thin (9 Å) photochromic layers which consist of azosilane molecules immobilized on silicon oxide substrates. Further, this light-induced change in the optical thickness of these films can be reversed upon irradiation with…