Materials Literature
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The porphyrin-sexithiophene-fullerene triad 2, where the two central thiophene units of the sexithiophene spacer are bridged with a crown-ether-like polyether chain, undergoes efficient intramolecular electron transfer from the photoexcited porphyrin moiety to the fullerene through the sexithiophene. However, complexa…
A new polybenzoxazole containing an adjacent hydroxyphenyl group was synthesized by using Suzuki coupling reaction accompanied by a simultaneous elimination reaction of acetyl protecting group of hydroxyl group. The polymer in solution as well as in the film exhibited a strong emission (520 nm) with a large Stokes shi…
Abstract Structural, dielectric and optical properties of the crystal C 3 N 2 H 5 ClO 4 have been studied by X‐ray diffraction, dielec‐tric and birefringence measurements. On cooling, structural phase transitions occurring at 373 K ( T c1 ) and 210 K ( T c2 ) are of second and first order, respectively. It is consider…
The complete elastic properties of tetrahedrally coordinated amorphous carbon (ta-C) thin films have been measured in the temperature range of 300–873K. Flexural and torsional mechanical oscillators were fabricated from ta-C, and using the resonant frequency of the oscillators as a function of temperature, we calculat…
Using a powerful multilevel simulation approach, we "visualize" the complete growth dynamics of hydrogenated silicon nanostructures under realistic experimental conditions of a plasma reactor. For the early stages of the synthesis, we demonstrate for the first time how precise control of atomic hydrogen not only permi…
Luminescent silica nanotubes SNT-2 (loaded with coumarion laser dye 2) and SNT-3 (loaded with anthracene laser dye 3) were prepared by sol-gel cocondensation of functional dyes and TEOS in a cholesterol-based organogel system. The emission colors of silica nanotubes were tuned by using different functional dyes. Inter…
The amorphous carbon thin films have been deposited on silicon and quartz substrates by microwave surface wave plasma chemical vapor deposition at low temperature (<100°C) in Ar∕CH4 phase gas. Doping of iodine has been done in the postdeposited films by exposing them in iodine vapor. The photovoltaic measuremen…
Sn19.3Cu4.7As22I8, a new clathrate-I compound with a cationic host framework containing transition metals, has been synthesized, and its crystal structure has been determined. It crystallizes in the cubic space group Pmn with a unit cell parameter a = 11.1736(3) angstroms and Z = 1 (R = 0.031 for 329 independent refle…
Photochromic diarylethene dimer derivatives with large two-photon absorption (TPA) cross-sections have been designed and synthesized. The derivatives have a D-pi-D structure in which indole rings are used as donor units (D) and 1,4-bis(ethynyl)benzene or 1,4-bis(ethenyl)benzene as a pi-conjugated chain unit (pi). Comp…
Fluorescence spectroscopy is employed to follow the ion exchange of an emissive dye--a carboxylated perylene imide--on a layered double hydroxide. The exchange of the carboxylate ions starts at the edges of the layered double hydroxide crystals and is followed by diffusion to the basal plane. Such space-resolved obser…
As the role for diagnostic and therapeutic contrast-enhanced imaging increases, review of the epidemiology, mechanisms, risk factors, and pretreatment for radiocontrast-mediated anaphylactoid reactions becomes more and more pertinent. Ongoing research has failed to elucidate the precise mechanisms of both early and la…
Mechanically responsive surfaces that allow to switch reversibly from a hydrophobic to a hydrophilic substrate are reported. The surfaces are constituted of polyelectrolyte multilayers deposited on modified charged silicone sheets. n bilayers of poly(allylamine)-Nafion (PAH-Naf) and m bilayers of poly(allylamine)-poly…
Reproducibly high-yield growth of zigzag fibers and well-faceted nanobelts of SnO2 was achieved via tuning the reactant vapor. The investigation of the morphological evolution via scanning electron microscopy and transmission electron microscopy hints that the formation of the zigzag SnO2 fiber is based on the pregrow…
4H-SiC visible-blind photodetectors specially designed for extreme ultraviolet (EUV) as well as ultraviolet (UV) detection are fabricated and characterised. Spectral quantum efficiency (QE) from 21.5 to 400 nm is determined. The devices have a 2×2 mm active area and less than 1 pA leakage current at low bias. The peak…
Die richtige Lösung für den Spin: Spintransfer und Solvatochromie/Thermochromie zeigt ein rein organisches offenschaliges System, in dem ein neutrales 6-Oxophenalenoxyl-Radikal als Elektronenacceptor direkt mit einer Tetrathiafulvalen-Einheit als Elektronendonor verbunden ist. Ein intramolekularer Elektronentransfer (…
The study of the anion ordered (TMTSF) 2 ClO 4(1 − x ) ReO 4 x solid solution in the limit of a low ReO 4 − substitution level (0 ⩽ x ⩽ 17%) has revealed a new and interesting phase diagram. Superconductivity is drastically suppressed as the effect of ReO 4 − non-magnetic point defects increases following the digamma…
We report the synthesis and characterization of the novel ligand H(5)EPTPA-C(16) ((hydroxymethylhexadecanoyl ester)ethylenepropylenetriaminepentaacetic acid). This ligand was designed to chelate the Gd(III) ion in a kinetically and thermodynamically stable way while ensuring an increased water exchange rate (kappa(ex)…
The reaction of 1,1-diphenylhydrazine with Ti(NMe2)2Cl2 produced the monomeric terminal titanium hydrazido(2-) species Ti(NNPh2)Cl2(HNMe2)2 (1) in near-quantitative yield. The reaction of Ti(NMe2)2Cl2 with the less sterically demanding ligand precursors 1,1-dimethylhydrazine or N-aminopiperidine gave the dimeric mu-et…
We show that near-spherical micrometer-sized colloidal particles at an interface of two fluids experience inter-particle forces merely as a consequence of their shape-induced capillary interaction. The interaction is strong even if the deviations from sphericity are on the nm-scale, and can hardly be avoided in experi…
The dynamics of colloidal star—linear homopolymer mixtures is investigated by photon correlation spectroscopy. In dilute star solutions, osmotic forces due to the added polymers lead initially to a shrinkage of the stars and eventually, at higher polymer concentrations, to stable star clusters. Furthermore, concentrat…