Materials Literature
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A brighter future for siloles. Luminescent silole chromophores with the highest quantum efficiencies reported for a fully substituted monomeric silole are generated by altering the steric properties of the substituent groups. Treatment of 1,1-dimethylsiloles with Bu4NF (TBAF) in THF rapidly gives stereospecific desily…
The compound of stoichiometry Mn(II)3[Mn(III)(CN)6]2.zH2O (z = 12-16) (1) forms air-stable, transparent red crystals. Low-temperature single crystal optical spectroscopy and single crystal X-ray diffraction provide compelling evidence for N-bonded high-spin manganese(II), and C-bonded low-spin manganese(III) ions arra…
Mehr hilft mehr: Fluoreszierende photochrome organische Nanopartikel (FPONs) aus 1 (siehe Bild) zeigen eine mit zunehmender Konzentration stark ansteigende Fluoreszenzemission sowie eine bistabile Photochromie. Ein kontrastreiches Ein/Aus-Schalten der Fluoreszenz wurde in größenabgestimmten FPONs aus 1 und in einem wi…
Fine-tuning the N-donor ability of a bidentate aminopyridyl ligand facilitated the selective synthesis of complexes 1 (no methyl substituent) and 2 (with a methyl substituent) which possess valence tautomeric nickel(II) semiquinonato and nickel(III) catecholato frameworks, respectively.
Highly dispersed palladium nanoparticles supported on carbon nanofibers, which show high catalytic activity and stability in the hydrogenation of cyclooctene, were synthesized by the two-step metal organic chemical vapor deposition (MOCVD) of allylcyclopentadienylpalladium (Pd(allyl)Cp) as precursor at atmospheric pre…
Robuste poröse Gerüste werden von den Dipeptiden L-Ala-L-Val (siehe Bild) und L-Val-L-Ala gebildet, die mit hoher Kapazität und Selektivität zur Gas-Sorption geeignet sind. Die Dipeptide ordnen sich unter Bildung von Wasserstoffbrücken als 61-Helices an, wobei Kanäle mit mittleren Durchmessern von 5.13 bzw. 4.90 Å ent…
We demonstrate that amorphous calcium carbonate (ACC) thin film crystallization on poly(ε-caprolactone) (PCL), poly(bisphenol A carbonate) (PC), poly( tert -butyl acrylate) (PtBA), and poly(methyl methacrylate) (PMMA) substrates is affected by the chain mobility and functionality of the polymers above and below their…
Abstract Electrospun nanofibers are made when electrostatic forces overcome the surface tension of a polymer solution, causing an electrically charged jet to be ejected; as the jet travels through the air, the solvent evaporates, leaving behind an electrically charged fiber, which can be collected in the form of a non…
Die chemische Reduktion von H[AuCl4] mit ortho-Phenylendiamin in wässriger Phase bei Raumtemperatur und Normaldruck ermöglicht die Synthese von einige Mikrometer langen Au-Nanotäfelchen (siehe SEM-Bild). Die Täfelchen fallen als Einkristalle mit einer Vorzugswachsrichtung entlang der Au-(111)-Ebene und vorwiegend hexa…
We have studied isotropic-to-nematic pretransitional fluctuations in an aqueous solution of disodium cromoglycate (cromolyn) by static and dynamic light scattering. Cromolyn is a representative of lyotropic chromonic liquid crystals with building units being elongated rods formed by aggregates of disk-like molecules.…
EuS nanocrystals, with an average diameter of 9 nm, have been synthesized by the photolysis of Na[Eu(S2CEt2)4].3.5H2O; the first quantum confined particles of EuS to be reported.
Two different approaches are compared for preparing titania-supported Au and Pd using dendrimer-encapsulated nanoparticle (DENs) precursors. First, preformed dendrimer-encapsulated nanoparticles (1−2 nm in diameter) were deposited onto a commercial solid-oxide support via wetness impregnation. Second, the same DENs we…
A series of glycolide/epsilon-caprolactone copolymers were compression molded and allowed to degrade in a pH 7.4 phosphate buffer at 37 degrees C. Degradation was monitored by various analytical techniques such as (1)H NMR, X-ray diffraction, DSC, CZE, ESI-MS, and inherent viscosity measurements. The results show that…
Illuminating phase changes: Absorption of X-ray photons induces reversible internal charge-transfer processes in the mixed-valence Mn/Fe cyanide Rb0.7MnII1.15[FeIII(CN)6]⋅2 H2O over a broad temperature range. Both continuous and abrupt phase transformations can be triggered (see scheme; HS=high spin, LS=low spin) and…
Magnetic hollow Fe3O4–polymer hybrid nanospheres (see figure) were prepared by adding Fe3O4 nanoparticles to an aqueous solution of polymer–monomer pairs composed of a cationic polymer (chitosan) and an anionic monomer (acrylic acid), followed by polymerization of acrylic acid and selective crosslinking of chitosan at…
The palladium(II)-substituted tungstosilicate [Cs(2)K(H(2)O)(7)Pd(2)WO(H(2)O)(A-alpha-SiW(9)O(34))(2)](9)(-) (1) has been synthesized and characterized by IR, elemental analysis, and electrochemistry. Single-crystal X-ray analysis was carried out on Cs(3)K(2)Na(4)[Cs(2)K(H(2)O)(7)Pd(2)WO(H(2)O)(A-alpha-SiW(9)O(34))(2)…
Modification of tetrathiafulvalene with an imidazolyl substituent as a hydrogen-bond donor allows the generation of a hydrogen-bonded 2:1 charge-transfer complex with chloranil. This complex forms a three-dimensional network with columnar stacking of each component and multiple S⋅⋅⋅S interactions (see picture). This s…
Abstract Nanocomposites based on biodegradable poly(butylene adipate‐ co ‐terephthalate) (PBAT) and layered silicates were prepared by the melt intercalation method. Nonmodified montmorillonite (MMT) and organo‐modified MMTs (DA‐M, ODA‐M, and LEA‐M) by the protonated ammonium cations of dodecylamine, octadecylamine, a…
A series of copolymers with various compositions were synthesized by bulk ring-opening polymerization of glycolide and epsilon-caprolactone, using stannous (II) octoate or zirconium (IV) acetylacetonate as initiator. Reaction time and temperature were varied so as to induce different chain microstructures. The resulti…
The spectroscopic properties of a spin-polarized two-dimensional hole gas are studied in modulation doped ${\mathrm{Cd}}_{1\ensuremath{-}x}{\mathrm{Mn}}_{x}\mathrm{Te}$ quantum wells with variable carrier density up to $5\ifmmode\times\else\texttimes\fi{}{10}^{11}\phantom{\rule{0.3em}{0ex}}{\mathrm{cm}}^{\ensuremath{-…