Materials Literature
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Many analytical techniques, such as differential scanning calorimetry (DSC), X-ray diffraction (XRD), infrared spectroscopy (IR) and Raman spectroscopy can be used to differentiate between crystalline polymorphs of the same chemical entity. While all of these techniques are routinely applied to off-line analysis of ma…
The thermodynamic potential of ideal gases described by the simplest non-abelian statistics is investigated. I show that the potential is the linear function of the element of the abelian-part statistics matrix. Thus, the factorizable property in the Haldane (abelian) fractional exclusion shown by the author [W. H. Hu…
A new terephthalate-based cobalt hydroxide, Co 2 (OH) 2 (C 8 H 4 O 4 ), was synthesized by the hydrothermal method. Its crystal structure has been determined by ab-initio XRPD methods (monoclinic, C 2/ m, a = 19.943(1), b = 3.2895(1), c = 6.2896(3) Å, β = 95.746(3)°) and fully refined by the Rietveld technique down to…
The aggregation of Au nanoparticles in solution is induced and influenced by cationic and oligocationic species. This solution-state aggregation bears similarities to multilayer formation on surfaces but is more facile because of the nanoparticles' intrinsic instability in solution. Aggregation is followed by transmis…
Das aus NO und NO2 gebildete N2O3 konkurriert mit Wassermolekülen um Koordinationsstellen der Natrium-Wasser-Netze in den Superkäfigen von Zeolith Na-Y. Infolgedessen ist die NOx-Adsorption durch diesen Zeolithen (siehe Bild) reversibel. Sie ist darüber hinaus unempfindlich gegenüber SO2 und bietet somit eine echte Al…
Enge Bandlücken und hohe Elektronenaffinitäten zeichnen konjugierte Oligomere aus, die Thiophen-1-oxid- und Thiophen-1,1-dioxid-Einheiten enthalten und durch Zirconocen-vermittelte Kupplungsreaktionen synthetisiert wurden. Eine Reihe von Oligomeren mit drei bis elf Ringen (X=2 H, S=O, S(=O)2; siehe Bild) ermöglichte e…
N,N'-Bis(2-propenyl)-2,7-diazapyrenium salts are synthesized in good yield from the reaction of 1,4,5,8-naphthalenetetracarboxylic dianhydride with allylamine, followed by LiAlH(4) reduction and subsequent oxidation with 2,3-dichloro-5,6-dicyano-1,4-benzoquinone (DDQ). The nature of the counteranion depends on the sol…
The stretching-induced alpha−beta polymorphic transition in the crystalline regions of poly(butylene terephthalate) (PBT) is studied by small-angle X-ray scattering (SAXS), instead of by the wide-angle X-ray scattering (WAXS) usually used for this purpose. An expression for the increase of the long spacing upon the tr…
A Cayley tree is the structural motif of the dendrimerlike supramolecular structure that is formed by self-assembly of the bile salt sodium deoxycholate (NaDC) with the β-cyclodextrin trimer T (see schematic picture). This is the first example of dendritic growth by a cyclodextrin complex.
Optical components, such as miniature spectrometer gratings working in the infrared range for environmental monitoring or physical analytics, contribute appeciably to the price of Micro Electro Opto Mechanical Systems (MOEMS). These optical components could be a part of a miniature functional package produced with an…
Pig heart CoA transferase (EC 2.8.3.5) has been shown previously to adopt a homodimeric structure, in which each subunit has a molecular weight of 52 197 and consists of N- and C-domains linked by a hydrophilic linker or "hinge". Here we identify and characterize a second oligomeric form constituent in purified enzyme…
NO and NO2 associated as the asymmetric N2O3 conformer compete with water molecules for coordination with sodium cations of the sodium–water clusters in supercages of the Na-Y zeolite. This reactive NOx adsorption is reversible (see picture), not sensitive to SO2, and presents an alternative method for the removal of…
Crystalline stereocomplex formation of isotactic poly(methyl methacrylate) ( it -PMMA) and syndiotactic poly(methyl methacrylate) ( st -PMMA) induced by high-pressure CO 2 at pressures in the 5−35 MPa range and at temperatures in the 30−110 °C range was demonstrated by means of differential scanning calorimetry (DSC)…
A high-spin ground state S>8 is obtained through ferromagnetic coupling in a FeIIFe complex that models the electronic properties of Prussian blue. The picture shows the postulated core structure for this heptanuclear complex.
Clusters of lithium atoms ranging in size from Li4 to Li40 and bulk metallic solids, including surfaces, are investigated through first principles electronic structure calculations, which are based upon density functional theory and the electron localization function (ELF). It is found that large lithium ppi-type cont…
Chromium acetyl acetonate [Cr(acac)3] complexes have been grafted onto the surface of two mesoporous crystalline materials; pure silica MCM-41 (SiMCM-41) and Al-containing silica MCM-41 with an Si:Al ratio of 27 (AlMCM-41). The materials were characterized with X-ray diffraction, N2 adsorption, thermogravimetrical ana…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTUmpolung of a Metal−Carbon Bond: A Potential Route to Porphyrin-Based Methane Functionalization CatalystsAndrew P. Nelson and Stephen G. DiMagnoView Author Information Department of Chemistry, University of Nebraska-Lincoln Lincoln, Nebraska 68588-0304 Cite this: J. Am…
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Transmission electron micrographs (TEM) of UO 2 2+ -negatively stained starburst dendrimers (SBDs), members of the family of dendritic macromolecules, have been analyzed in the absence and in the presence of dimyristoyl-phosphatidylcoline (DMPC) liposomes and mixed DMPC/DMPA-Na (the sodium salt of DMP-colate) liposome…
Enzymatic ring-opening copolymerization of 5-methyl-5-benzyloxycarbonyl-1,3-dioxan-2-one (MBC) with trimethylene carbonate (TMC) was investigated. A route to aliphatic polycarbonates decorated with pendent carboxylic acid groups is demonstrated. Lipase from Pseudomonas fluorescens (AK) was selected to perform the copo…