Materials Literature
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The title compound, [Fe(btr)(3)](ClO(4))(2), has been synthesized. The investigation of its magnetic properties has revealed a low-spin <--> high-spin conversion occurring in two steps, each step involving 50% of the Fe(2+) ions. The low-temperature step is very abrupt and occurs with a thermal hysteresis whose width…
Organosoluble polyimide/silica hybrid materials were prepared using the sol–gel process. The organosoluble polyimide was based on pyromellitic anhydride (PMDA) and 4,4′-diamino-3,3′-dimethyldiphenylmethane (MMDA). The silica particle size in the hybrid is increased from 100–200 nm for the hybrid containing 5 wt % sili…
We present an calculation of the electronic and optical excitations of an isolated polythiophene chain as well as of bulk polythiophene. We use the GW approximation for the electronic self-energy and include excitonic effects by solving the electron-hole Bethe-Salpeter equation. The inclusion of interchain screening i…
Cluster research so far only dealt with either 3D free clusters or clusters on substrates with strong electronic coupling at the interface. Preparation of free and orientated 2D clusters is usually not possible because one of these conditions generally excludes the other. We demonstrate a new way to grow 2D clusters o…
The generalized boundary conditions for the envelope wave function that take into account the real structure of an interface were used to investigate the hole spectrum of the semiconductor quantum dot embedded in an insulator matrix. An essential influence of the interface levels, which could exist at the top of the v…
[formula: see text] N-Confused meso-substituted porphyrin is a porphyrin isomer previously available from one-flask porphyrin syntheses as a low-yield byproduct (< 7.5%). We have found that methanesulfonic acid catalyzed condensation of pyrrole and benzaldehyde followed by DDQ oxidation provides N-confused tetraphenyl…
A simple and general procedure has been developed for the syntheses of ordered large-pore (up to 14 nm) mesoporous metal oxides, including TiO 2, ZrO 2, Nb 2 O 5, Ta 2 O 5, Al 2 O 3, SiO 2, SnO 2, WO 3, HfO 2, and mixed oxides SiAlO y, Al 2 TiO y, ZrTiO y, SiTiO y, ZrW 2 O y . Amphiphilic poly(alkylene oxide) block co…
Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” opt…
Single phase Ba(Mg 1/3 Ta 2/3 )O 3 films were prepared on Si (100) substrates and a fused silica substrate by pulsed laser deposition. The structure and annealing properties of these films were studied by the x-ray -2 scan. The wavelength dependence of the transmittance of the films deposited on fused silica was deter…
Using a graphite rod with a hole filled with the powder of a mixture of Y−Ni alloy and graphite as anode, single-wall carbon nanotubes (SWCNTs) with 50%−70% purity were produced in quantity of tens of grams a day under the arc conditions of 40−60 A d.c. and helium pressure of 2 atm. If calcium−nickel was used as catal…
Two new Au(I) dimethylpyrimidinethiolate complexes have been synthesized. The dimer [Au(4,6-Me2pym-2-S)]2 possesses a solid state structure in which π-stacking dominates over intermolecular Au···Au bonding. In solution, the dimer gives evidence of facile dissociation while exhibiting concentration dependent luminescen…
<div class="section abstract"><div class="htmlview paragraph">This paper describes the use of forming simulation output data from a hydroformed frame siderail as initial material properties for crash simulation of the component. The hydroforming simulation model is described and correlated to test measurem…
The toluene solvates of meso-tetrakis(4-halophenyl)porphinatomanganese(III) tetracyanoethenide, [MnTFPP][TCNE] (1F), [MnTBrPP][TCNE] (1Br), and [MnTIPP][TCNE] (1I) have been prepared, and the magnetic and thermal properties have been determined and compared to those of [MnTClPP][TCNE] (1Cl). 1Br and 1I form uniform 1-…
We have considered the dynamical evolution of cellular patterns controlled by a stochastic Glauber process determined by the deviations of local cell topology from that of a crystalline structure. Above a critical temperature evolution is towards a common equilibrium state from any initial configuration, but beneath t…
The synthesis of the parent bis(pyrrolo[3,4- d ])tetrathiafulvalene via a nonclassical and simple pyrrole synthesis is reported, together with a detailed study of the fundamental redox behavior of some of this class of heterocycles.
Chemotherapy is commonly used in the treatment of cancers. However, the mechanism of action of many of these agents is not well understood. We present the synthesis of a two-photon fluorophore (C625) and its biological application when chemically linked to a chemotherapeutic agent (AN-152). By using two-photon laser-s…
Nanostructured CeO 2 - x and Cu 0.15 Ce 0.85 O 2 - x were synthesized by high-pressure magnetron sputtering. X-ray diffraction was used for phase analysis and grain size characterization. The structural analysis indicated that Cu was highly dispersed, which could be explained by surface segregation on cerium oxide nan…
Relationships between the structure, properties, and processing techniques of model polymer gels are investigated. The mechanical properties of the gels are determined by a thermally reversible aggregation of the syndiotactic PMMA end blocks of an acrylic triblock copolymer, which is diluted with a selective solvent f…
The spatial distribution of the terminal groups of poly(amido amine) dendrimers have been determined experimentally by small-angle neutron scattering with deuterium labeling and scattering contrast variation. The radius of gyration of deuterated terminal units of generation 7 dendrimers is 39.3 ± 1.0 Å. This is signif…
The average dimensions of poly(amido amine) (PAMAM) dendrimers of generations G5 and G8 are studied by small-angle neutron scattering (SANS) as a function of solvents of differing quality, the composition of mixtures of a good solvent and a nonsolvent, and temperature. The radius of gyration, R g, of the G8 dendrimer…