Materials Literature
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We study the diffraction patterns of a one-dimensional Fibonacci chain from quasiperiodic pulse trains. We find a single prominent peak when the dynamics of the incident wave matches the arrangement of the scatterers, that is, when the pulse train and the scatterers are in resonance. The maximum diffraction angle and…
cis oder trans? – beides! Zwei Typen dimerer PtII-Komplexe mit invertierten Porphyrinliganden wurden hergestellt und durch Röntgenstrukturanalyse eindeutig charakterisiert (siehe Bild). In beiden Komplexen bindet ein invertiertes Porphyrin über das äußere Stickstoffatom sowie das ortho-Kohlenstoffatom einer meso-Arylg…
The effect of the spatial distribution of hydrophobic surface residues on the adsorption of a weakly hydrophobic polymer to proteins has been examined using a coarse-grain model solved by Monte Carlo simulations. A given number of surface sites were distributed randomly on the protein surface subjected to a distance c…
The quantum oscillatory effect and superconductivity in a non-tetrachalcogenafulvalene (TCF) -structure-based organic superconductor $\ensuremath{\beta}\ensuremath{-}(\mathrm{B}\mathrm{D}\mathrm{A}\ensuremath{-}\mathrm{T}\mathrm{T}\mathrm{P}{)}_{2}{\mathrm{SbF}}_{6}$ are studied. Here the Shubnikov--de Haas effect and…
A heterometallic tetranuclear cluster resulting from an unprecedented metal–metal interaction is described in which a 14-electron PdL2 fragment is bonded to a Fe-Hg-Fe chain through helically arranged diphenylphosphanylmethane ligands (see picture), along which it exhibits an oscillating motion. The cluster exhibits a…
In this Communication, we report the first example of photoswitching of a ferroelectric SmC* liquid crystal based on a photoinduced sign inversion of the spontaneous polarization (PS) induced by a single chiral dopant. This is achieved without concomitant destabilization of the SmC* phase using the "ambidextrous" dopa…
We study the structure and stability of closed-ring carbon nanotubes using a theoretical model based on the Brenner-Tersoff potential. Many metastable structures can be produced. We focus on two methods of generating such structures. In the first, a ring is formed by geometric folding and is then relaxed into minimum…
A new o -PANI- co - p -PANI copolymer was prepared in order to allow for the introduction of solubilizing and function-enhancing substituents on the conducting polymer backbone without concomitant loss of conductivity. An urea-protected trimeric aniline macromonomer with para − ortho − para connectivity and bromine en…
Abstract For Abstract see ChemInform Abstract in Full Text.
Abstract A new type of maleimide monomer, N ‐(4‐acetylphenyl)maleimide (NAPMI), was synthesized. The oxime, carbazone, and thiosemicarbazone derivatives of NAPMI were prepared with hydroxylamine hydrochloride, semicarbazide hydrochloride, and thiosemicarbazide hydrochloride, respectively. Radical homopolymerization of…
The morphology and crystallization behavior of freeze-extracted isotactic polystyrene ( i PS) derived from concentrated solutions in solvents of middle molecular size were characterized by the wide-angle X-ray diffraction, infrared spectroscopy, and differential scanning calorimetry. It was found that the freeze-extra…
An intimate historical and conceptual association exists between crystals and chirality. Yet the relationships between crystal symmetry and crystal morphology are not fully understood. In biological environments, molecular recognition between biological macromolecules and crystal surfaces can affect crystal morphologi…
Confusion but no doubt: Two types of PtII dimer complexes of N-confused porphyrin (depicted) were synthesized and the structures were unequivocally elucidated by X-ray crystal analyses. Both complexes contain a metallocycle that binds to a Pt center by an outer-nitrogen atom of the confused porphyrin, and by an ortho-…
The anomalous Hall effect due to the spin chirality order and fluctuation is studied theoretically in a Kondo lattice model without the relativistic spin-orbit interaction. Even without the correlations of the localized spins, ${\ensuremath{\sigma}}_{xy}$ can emerge depending on the lattice structure and the spin anis…
Fours for thought: The title compound was prepared by condensation of the preformed unit {Mo2O2S2}2+ as a linker on to the trivacant anion [α-P2W15O5]12−. The self-assembled structure exhibits a modular arrangement (see structure). 31P and 183W NMR spectroscopy revealed that the structure of the supramolecular tetra-u…
This is the first comprehensive study on the kinetic modeling of adiabatic decomposition of di- tert -butyl peroxide (DTBP) and its solvent mixtures. The adiabatic thermal decomposition of DTBP and its solvent mixtures was examined using an accelerating rate calorimeter under varying thermal inertia. The decomposition…
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An ordered hexagonal mesoporous nickel oxide was prepared for the first time using sodium dodecyl sulfate as the surfactant and urea as the hydrolyzing agent. The resulting oxide showed mesoporous structure with pore size ranging from 4 to 7 nm. Calcination at different temperatures was carried out, and the mesoporosi…
[reaction: see text] Regioselectivity of the oxidative coupling of 5,10,15-triarylporphyrin metal complexes with DDQ-Sc(OTf)(3) was dependent on the central metal and meso-aryl substituent. Oxo-quinoidal porphyrin was obtained from Ni(II) porphyrin under the same conditions.
Crystal conversion of beta-chitin to alpha-chitin by aq. NaOH treatment was studied for a highly crystalline beta-chitin sample from diatom spine. The minimum NaOH concentration to cause swelling was between 25% and 30% w/w. The alkali-swollen material was poorly crystalline and was regenerated as alpha-chitin on wash…