Materials Literature
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No racemization occurs in the first reported enantioselective photochromic reaction. Upon irradiation with UV light, a single enantiomer of [2.2]metacyclophane-1-ene 1 a undergoes photocyclization to give a single enantiomer of tetrahydropyrene 1 b. Upon irradiation with visible light, 1 b is converted back cleanly in…
TiO2 in besonderem Licht: Die bemerkenswerten photochemischen Eigenschaften von TiO2 ermöglichen die einfache und präzise schrittweise Musterbildung kolloidaler Kristallfilme. Durch Bestrahlen wird auf einer TiO2-Oberfläche ein Muster aus hydrophoben und hydrophilen Stellen erzeugt; anschließend wird ein Film von mono…
The potential energy diagram for the NO+CO reaction on 1, 2, and 3 monolayer (ML) Pd films supported by MgO(100) is calculated using density functional theory. Thin Pd films are generally found to be more reactive than thick films, with a notable exception for nitrogen adsorption on 2 ML Pd/MgO(100). For this system a…
The title compound was synthesized by slow diffusion of aqueous solutions containing K4[Mo(CN)7].2H2O, [Mn(H2O)6](NO3)2, and [N(CH3)4]Cl. The compound crystallized in monoclinic space group C2/c, a = 25.8546(14), b = 12.3906(7), c = 13.5382(7) A, beta = 116.4170 (10) degrees, Z = 4, R = 0.0353, wR2 = 0.0456. The MoIII…
The adsorption of nitric oxide (NO) on a Cu(100) surface at 25 K has been studied using infrared reflection absorption spectroscopy (IRAS). Initially, NO adsorbs at the bridge site; however, with an increase in coverage, dimerization of NO occurs. Further dosing of NO at 25 K produces a multilayer of the NO dimer. Ann…
Easily synthesised and a candidates for organic electronic devices are the azaaromatic esters 1 (with R=alkyl). These materials show a columnar plastic crystalline phase at room temperature, in which the columns align perpendicular to a supporting electrode surface, and they exhibit π-orbital energy values that are ve…
The propensity of solid state polytelluride compounds to form structures with extended square nets of tellurium and the physicochemical properties of these nets is discussed in view of recent results showing that these square nets of tellurium are in fact average structures. The real structures are strongly modulated,…
Caged reagents are photoactivatable molecules with applications in biological research. While a great deal of work has been carried out on small caged molecules, less has been done on caged macromolecules, such as proteins. Caged proteins would be especially useful in signal transduction research. Since most proteins…
We report a trinuclear Co(II) complex containing bridging dicyanamides and a tris-chelated HAT, which possesses approximately 37% void space. The magnetic exchange pathways appear in the structure as a corner sharing tetrahedral network. The compound crystallizes in the monoclinic space group P2(1)/c [a = 13.655(3) A,…
Analysis of correlation between growth rates and interfacial structure of a crystal is the key to understanding the growth behavior of crystal faces. The subject of this paper is research on the morphological importance of crystal faces in connection with their growth rates and crystallographic structure of the crysta…
Poly(3-hydroxybutyrate-co-3-hydroxyoctanoate), PHBO, represents a class of PHA copolymers that contain both short-chain-length and medium-chain-length repeat units. Radiolabeled and cold PHBO, containing 90 mol % 3-hydroxybutyrate and 10 mol % 3-hydroxyoctanoate were chemically synthesized using a new difunctional alk…
In this paper we describe a new approach for the formation of nanoporous particles in which a thermally stable, water-soluble, and therefore easily leached second component is employed during spray pyrolysis to produce a composite particle. We demonstrate the new synthetic approach for synthesizing nanoporous aluminum…
The unique photochemical properties of TiO2 provides a stepwise approach for the easy and precise patterning of colloidal crystal films. In this approach patterns of hydrophobic and hydrophilic areas are formed on a TiO2 surface and then a colored film of monodispersed polystyrene spheres is deposited on to the hydrop…
This study describes the transformation of cellulose acetate filters into porous carbon structures by a facile, direct process. Filters from cigarettes were used as the source for cellulose acetate filters. Carbon was obtained by high-temperature treatment under inert conditions without extensive preparative methods.…
Die Materialwissenschaften zeichnen uns eine Zukunft, in der selbstreparierenden und intelligenten Materialien eine bedeutende Rolle zukommt. Dieses Konzept findet in den letzten Jahren durch eine neue Klasse von Polymeren stetig wachsende Beachtung. Die Formgedächtniskunststoffe, die in Anlehnung an den englischen Be…
A simple and efficient synthetic method for highly ordered nanoporous carbons with high mechanical and thermal stability has been performed through a direct template carbonization using as-synthesized MCM-48 hosts.
Large low-field magnetoresistance (LFMR) together with high Curie temperatures (TC) are requirements for some applications in magnetoelectronics. In order to optimize both parameters, we have investigated double perovskites (Ba0.8Sr0.2)2−xLaxFeMoO6 (0⩽x⩽0.4). High-temperature neutron diffraction measurements indicate…
Shape-persistent multi(NCN-palladium and/or -platinum) complexes having one- (5 and 6), two- (1 and 2), and three-dimensional (3 and 4) geometries were prepared in moderate to good yields. Two different approaches were used to construct the multimetallic materials: (i) the construction of the multisite ligands followe…
To develop biodegradable packaging that both acts as a moisture barrier and as antimicrobial activity, nisin and stearic acid were incorporated into a hydroxy propyl methyl cellulose (HPMC) based film. Fifteen percent (w/w HPMC) of stearic acid improved film moisture barrier. However, film mechanical resistance and fi…
Contact-induced damage has been studied in single-crystal (wurtzite) ZnO by cross-sectional transmission electron microscopy (XTEM) and scanning cathodoluminescence (CL) monochromatic imaging. XTEM reveals that the prime deformation mechanism in ZnO is the nucleation of slip on both the basal and pyramidal planes. Som…