Materials Literature
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Aluminosilicate MCM-41 mesophase solids have been prepared under alkaline conditions with high degrees of mesoscopic order and silicon-to-aluminum molar ratios approaching unity. One- and two-dimensional solid-state NMR techniques, in conjunction with elemental analyses, infrared spectroscopy, and powder X-ray diffrac…
The complexes [Cu 2 (dpt) 2 Cl 2 ]X 2 (dpt = dipropylenetriamine; X = Cl, 1; X 2 = (Cl)(BPh 4 ), 2 ) have been prepared and their magnetic properties studied. The crystal structure of complex 1 has been solved. The compound belongs to the C 2/ c space group with Z = 4, a = 17.201(2) Å, b = 10.873(2) Å, c = 11.835(2) Å…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTSquare and Triangular Arrays Based on Mo24+ and Rh24+ UnitsF. Albert Cotton, Lee M. Daniels, Chun Lin, and Carlos A. MurilloView Author Information Department of Chemistry and Laboratory for Molecular Structure and Bonding P.O. Box 30012, Texas A&M University College S…
Well-dispersed platinum colloids have been prepared on polystyrene nanospheres with surface-grafted poly( N -isopropylacrylamide) (PNIPAAm) via the reduction of PtCl 6 2 - by ethanol. A range of monodisperse nanospheres was obtained by emulsifier-free dispersion copolymerization of styrene with a PNIPAAm macromonomer.…
Three different multicomponent molecular systems have been synthesized by means of the three-dimensional template effect of copper(I). These systems incorporate both a coordinating ring (2,9-diphenyl-1,10-phenanthroline-containing 30-membered ring) and a molecular string which consists of two different coordination si…
This paper describes the oriented nucleation of calcite controlled by self-assembled monolayers (SAMs) of ω-terminated alkanethiols (HS(CH 2 ) n X) supported on metal films. The effect of the chemistry and geometry of the organic surfaces was surveyed by using different functional groups (X = CO 2 -, SO 3 -, PO 3 2 -,…
We describe a simple method to control the size of Pt nanoparticles with the use of an alcohol reduction. They then are assembled on the electrode by an electrophoretic deposition. The mean diameter of monodispersed Pt nanoparticles can be controlled from 19 to 33 Å in one-step reaction by changing the kind and/or the…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTMg−Al Mixed Oxides as Highly Active Acid−Base Catalysts for Cycloaddition of Carbon Dioxide to EpoxidesKazuya Yamaguchi, Kohki Ebitani, Tomoko Yoshida, Hisao Yoshida, and Kiyotomi KanedaView Author Information Department of Chemical Science and Engineering Graduate Sch…
The preparation of ultrahydrophobic and ultralyophobic surfaces using several techniques is described. Plasma polymerization of 2,2,3,3,4,4,4-heptafluorobutyl acrylate on poly(ethylene terephthalate) yields surfaces with water contact angles of θ A /θ R = 174°/173°. Argon plasma etching of polypropylene in the presenc…
Phase separation in nuclear waste glasses has an adverse effect on glass durability. Phase separation in glasses generally takes the form of two immiscible glass phases which differ in chemical composition, density, and surface tension. Usually one phase is more soluble than the other. Phase separation complicates mod…
In studying the avalanches and noise in a model of hysteresis loops we have developed two relatively straightforward algorithms which have allowed us to study large systems efficiently. Our model is the random-field Ising model at zero temperature, with deterministic albeit random dynamics. The first algorithm, implem…
Frequency dependent current noise in ferromagnetic double junctions with Coulomb blockade is studied theoretically in the limit of sequential tunneling. Two different relaxation processes are found in the correlations between spin polarized tunneling currents; low frequency spin fluctuations and high frequency charge…
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Novel types of donor−acceptor (DA) molecules, consisting of covalently linked pyropheophytin−anthraquinone (PQ and ZnPQ) and phytochlorin−anthraquinone (PCQ and ZnPCQ) dyads and their diastereomers were studied by means of steady-state and time-resolved fluorescence and absorption spectroscopies. Conformational proper…
Both first principles pseudopotential calculations and atomistic simulations have been employed to study the MgO{100}/Ag{100} and MgO{110}/Ag{110} interfaces. For both interfaces the most stable structure was determined to be where the Ag atoms are situated above the O2− ion. The binding energy for the {110} interface…
The monomeric ferric hemepeptide from cytochrome c, N -acetylmicroperoxidase-8 (NAcMP8), retains the proximal His ligand and has a coordinated water molecule in the second axial site. It provides an opportunity for quantitatively studying in aqueous solution the coordination chemistry of an iron porphyrin with a singl…
The collective electronic oscillators method is used to construct an effective Frenkel exciton Hamiltonian for conjugated dendrimers with fractal geometry. Self-similarity and the high degree of symmetry utilized by decomposing the space of optical excitations into irreducible representations make it possible to compu…
The segmental dynamics of PMPS chains are determined in the bulk liquid and cross-linked networks of varying cross-link density by broad-band dielectric relaxation spectroscopy. A large fragility index [τ( T g */ T ) dependence], F 1/2 = 0.77, is found, independent of cross-link density, molecular weight, and T g . Al…
To answer the question of which fatty acid residue is the most effective, diacetyltartaric esters of monoglycerides (DATEMs) with fatty acids of chain lengths 6:0-20:0 were synthesized. The activity of synthesized DATEMs and commercial DATEM products was studied by means of rheological methods and a microscale baking…
Electron paramagnetic resonance (EPR) lineshapes of nitroxide spin probes in a variety of organic supercooled liquids and glasses were analyzed within the framework of the fast librational motion model. Computer simulation confirmed that the EPR lineshape may be fitted well by the librational model. For all systems st…