Materials Literature
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The structural characterization of melt-crystallized samples and oriented fibers of syndiotactic copolymers between propene and 1-butene is reported. Melt-crystallized samples of copolymers are crystallized in the form I of syndiotactic polypropylene (s-PP) up to a content of 1-butene of 60−70 mol %, although disorder…
NiO in Verbindung mit Aluminiumoxid wurde durch Temperatur-programmierte Reduktion als die aktive Spezies in Ni-Al-Hydrotalcit-Katalysatoren bestimmt. Diese Katalysatoren können α-Ketole sowie benzylische und allylische Alkohole zu den entsprechenden Carbonylkomponenten quantitativ und unter milden Reaktionsbedingunge…
Adsorption and electrosorption behavior of ethyl xanthate (EtX - ) and thiocyanate (SCN - ) anions, individually and when they are together in a solution, were studied at high-area C-cloth electrodes by in situ UV spectroscopy in relation to development of methodologies for purification of industrial wastewaters. The…
The origin of enantioselectivity in the Jacobsen-Katsuki reaction has been investigated by applying density functional calculations in combination with molecular mechanics methodologies. The calculations suggest that a high enantiomeric excess is connected to three specific features: 1) a chiral diimine bridge, which…
The preparation and structural characterization of scandium and f-element complexes derived from the disiloxanediolate dianion, [(Ph2SiO)2O]2-, are reported. Reactions of in situ prepared Ln[N(SiMe3)2]3 (Ln = Eu, Sm, Gd) with (Ph2SiOH)2O in different stoichiometries afforded the lanthanide disiloxanediolates [Eu[[(Ph2…
The theoretical analysis on the zero point of charge (ZPC) and charge density of colloidal particles possessing permanent charges indicates that ZPC determined directly by means of potentiometric titration (PT) should be zero point of net charge (ZPNC) and the permanent charge density (σ P ) can be obtained from the a…
Ein organisch-anorganisches Hybrid: In Gegenwart von kationischen Nitronylnitroxid-Radikalen kann sich ein neuer Typ von Mischmetalloxalaten [MnII(H2O)CrIII(ox)3]− bilden. Die stabilen freien Radikale befinden sich in dem dreidimensionalen anorganischen Netzwerk, das hier stilisiert dargestellt ist (○ = Mn, • = Cr); d…
Der Bedarf der pharmazeutischen und agrochemischen Forschung an Substanzbibliotheken hat eine verstärkte Suche der Industrie nach neuen Technologien, die die Automatisierung von Syntheseprozessen erlauben, zur Folge. Seit den Pionierarbeiten von Merrifield spielen polymere Trägermaterialien eine Schlüsselrolle in dies…
The novel macromolecule, poly(benzo[ c ]thiophene -N -2-ethylhexy-4,5-dicarboxylic imide) (EHI−PITN), has been designed and synthesized. The polymer has a well-defined structure which was characterized by FTIR, 1 H NMR and 13 C NMR spectroscopies, and elemental analysis. TGA analysis indicates that the polymer has goo…
Megavolt-per-second cyclic voltammetry is used to control the expansion with time of a diffusion layer created within the redox outer shell of a fourth generation dendrimer molecule adsorbed onto an electrode; one quarter of the dendrimer is shown in the picture. This allows the measurement of the degree of communicat…
Photoprocesses associated with the complexation of a pyridine-functionalized C60 fullerene derivative to ruthenium- and zinc-tetraphenylporphyrins (tpp) have been studied by time-resolved optical and transient EPR spectroscopies. It has been found that upon irradiation in toluene, a highly efficient triplet-triplet en…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTCationic Hyperbranched Poly(amino ester): A Novel Class of DNA Condensing Molecule with Cationic Surface, Biodegradable Three-Dimensional Structure, and Tertiary Amine Groups in the InteriorYong-beom Lim, Seon-Mi Kim, Yan Lee, Woo-kyoung Lee, Tae-gyun Yang, Min-jae Lee…
X-ray diffraction data at atomic resolution to 0.98 A with 136 380 observed unique reflections were collected using a high quality proteinase K crystals grown under microgravity conditions and cryocooled. The structure has been refined anisotropically with REFMAC and SHELX-97 with R-factors of 11.4 and 12.8%, and R(fr…
Tetraaryloxy-substituted perylene tetracarboxylic acid bisimides with one or two 4-pyridyl receptor substituents at the imide functionality were synthesized and employed in transition metal directed self-assembly with Pd(II) and Pt(II) phosphane triflates. Upon mixing of the components, quantitative formation of funct…
We survey recent work on designing and evaluating quantum computing implementations based on nuclear or bound-electron spins in semiconductor heterostructures at low temperatures and in high magnetic fields. General overview is followed by a summary of results of our theoretical calculations of decoherence time scales…
Twenty-three triboluminescent organic and inorganic materials were examined for crystal symmetry, differences between photoluminescence and triboluminescence emission spectra, spectroscopic evidence of an electrical discharge, and persistence of activity under liquids; some were also tested under other atmospheres. Th…
The optical properties and electronic structure of a homologous series of CdSe cluster molecules covering a size range between 0.7 and 2 nm are investigated. CdSe cluster molecules with 4, 8 10, 17, and 32 Cd atoms, capped by selenophenol ligands, were crystallized from solution and their structures determined by sing…
Thermogravimetric analysis (TGA) simultaneously coupled with mass spectrometry (MS) and Fourier transform infrared spectrometry (FTIR) was developed as an original technique to study the thermal modification/degradation of poly(epsilon-caprolactone) (PCL) through in depth analysis of the evolved gas. Perfectly well-de…
Carbon nanotubes were discovered soon after the successful laboratory synthesis of fullerenes. Since their discovery in 1991, there has been intensive research activity in the area of carbon nanotubes, not only because of their fascinating structural features and properties, but also because of their potential technol…
The photoinduced surface wettability conversion reactions of ZnO and TiO 2 thin films were investigated by means of water contact angle measurement and X-ray photoelectron spectroscopy. Before ultraviolet (UV) illumination, ZnO and TiO 2 films exhibited water contact angles of ∼109 and ∼54°, respectively. UV illuminat…