Materials Literature
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We describe the synthesis of novel copolymers containing quinoline, benzene, and alkyne groups by a Pd-catalyzed Heck−Cassar−Sonogashira−Hagihara reaction. Direct iodination of quinoline by a mixture of iodine, potassium periodate, and sulfuric acid in chloroform gives 3,6-diiodoquinoline. 3,6-Diiodoquinoline was coup…
Big blue-walled tires: A diamagnetic blue 28-electron reduced species [MoMoO432H28(H2 O)58]12− ({Mo142}) was produced photochemically by the degradative self-assembly of [Mo36O112(H2O)16]8− ({Mo36}). The molybdenum blue photochemistry is not only suitable for the investigation of the mechanism of degradation self-asse…
Size-tunable CdS nanorods have been synthesized via the reaction at low temperature (25−65 °C) of air-insensitive inorganic precursors cadmium acetate and sodium sulfide in an aqueous phase with surfactant. Nonionic pluronic amphiphilic triblock copolymers, (EO) x (PO) y (EO) x, were employed as structure-directing ag…
Differential scanning calorimetry (DSC), atomic force microscopy (AFM), wide-angle X-ray scattering (WAXD), and solid-state (13)C NMR have been used to investigate the crystalline/amorphous structure and molecular mobility of biodegradable poly(butylene adipate-co-44 mol % butylene terephthalate) [P(BA-co-44 mol % BT)…
Two novel tetradecanuclear hydroxo-lanthanide complexes, formulated as Ln14(mu 4-OH)2(mu 3-OH)16(mu-eta 2-acac)8(eta 2-acac)16, Ln = Tb, 1; Eu, 2; acac = acetylacetonato, were synthesized and characterized by single-crystal X-ray diffraction, elemental analysis and phosphorescence spectroscopy.
A series of polyvinyl alcohol (PVA)–selenide nanocomposites, including PVA–Ag2Se, PVA–Cu2 − xSe, PVA–ZnSe and PVA–PbSe, were successfully prepared at room temperature and ambient pressure via a simple one-step solution growth technique. X-Ray diffraction (XRD), transmission electron microscopy (TEM) and infrared spect…
Here we report a coordination polymer based, stable organogel (termed 'metallogel' to emphasize the essential role of metal-ligand bonding during the gelation), which 'uptakes' neutral organic molecules from the aqueous phase.
We have determined the crystal structure of the enzyme enoyl-CoA hydratase (ECH) from rat liver with the bound substrate 4-(N,N-dimethylamino)cinnamoyl-CoA using X-ray diffraction data to a resolution of 2.3 A. In addition to the thiolester substrate, the catalytic water, which is added in the hydration reaction, has…
Solid-state cross-linking of elastin−mimetic fibers was investigated. Through available lysine residues, an elastin−mimetic protein polymer, poly((Val-Pro-Gly-Val-Gly) 4 (Val-Pro-Gly-Lys-Gly)) 39, was modified to incorporate an acrylate moiety. The degree of acrylate functionalization could be varied by changing the r…
We present first-principles calculations on electron transport through Na nanowires at finite bias voltages. The nanowire exhibits a nonlinear current-voltage characteristic and negative differential conductance. The latter is explained by the drastic suppression of the transmission peaks which is attributed to the el…
Poly(L-lactide) (PLLA) thin film with 100 nm thickness was crystallized at 160 degreesC for 20 min from the melt obtained at 220 degreesC. Hexagonal crystals with three types of growth (derivative growth lamellae, overgrowth multistacked lamellae, and undergrowth multistacked lamellae) were simultaneously observed by…
The incorporation of the rare-earth complex [C 5 H 5 NC 16 H 33 ][Eu(TTA) 4 ] into surface-modified mesoporous molecular sieve Si−MCM-41 via reactions of the surface Si−OH with different silylation agents such as (C 2 H 5 O) 3 Si(CH 2 ) 2 NH(CH 2 ) 2 NH 2 (NSED), (C 2 H 5 O) 3 Si(CH 2 ) 3 NH 2 (APTES), and (C 2 H 5 O)…
A direct pyrolysis method from artificial lamellar mesostructures to nanotubes was developed for the synthesis of tungsten disulfide (WS(2)) nanotubes. In this process, a tungsten sulfide artificial lamellar mesostructure composite with intercalated cetyltrimethylammonium cations (WS-L) was prepared on the basis of th…
Polymer composites based on organically modified phyllosilicates (organoclay) and poly(ethylene- co -vinyl acetate) (EVA) were prepared by melt processing to study their combustion behavior. Their degrees of dispersion and intercalation spacings as determined by transmission electron microscopy (TEM) and X-ray diffrac…
We report the solution-based synthesis of single-crystalline nanorods composed of barium titanate (BaTiO3) and strontium titanate (SrTiO3), which yields well-isolated nanorods with diameters ranging from 5 to 60 nm and lengths reaching up to >10 mum. Electron microscopy and diffraction measurements show that these nan…
Over the past years, various attempts have been made to accurately model the radiation response of the optical attenuation in optical fibres for nuclear environments. In this paper we present the results of a study on pure silica fibres where both the spectral and kinetic behaviour are explored during and after irradi…
Preparation of quartz (rock crystal) films has been studied by an atmospheric pressure chemical vapor deposition method using Si(OC2H5)4 and O2 as starting materials in the presence of gaseous HCl. The films were deposited onto a sapphire (0001) substrate at 600–850 °C with a growth rate of 0.3–3.0 µm h−1. Their X-ray…
A novel cobalt beryllophosphate (CBP-CHA) with the chabazite framework topology has been hydrothermally synthesized by using a metal amine complex as a starting material. The structure was solved by single-crystal X-ray diffraction {crystal data for [C6N4H24]CoBe6P6O24·3H2O: M = 889.14, rhombohedral, space group R, a…
The possibility of exploiting the self-organization of mobile silicon atoms on silicon surfaces during ultrahigh vacuum thermal annealing for the construction of silicon-on-silicon structures is demonstrated. Rearrangement of the surface during thermal decomposition of an oxide layer can be controlled allowing the gro…
The crystal structure of Pb 7 O 4 (OH) 4 Cl 2 (monoclinic, C 112 1 , a = 5.791(2), b = 12.998(4), c = 19.330(6) A, γ = 90.089(3)°, V = 1455.1(8) A 3 ) has been solved by direct methods and refined to R 1 = 0.061 using X-ray diffraction data collected from a crystal twinned on (010). There are seven symmetrically indep…