Angewandte Chemie International Edition

Published by Wiley-VCH Verlag
Online ISSN: 1521-3773
Publications
Article
Near C(3) symmetry is displayed by the 19-atom In-P polyhedron that forms the central structural unit in the title compound (see structure), which was synthesized by reaction of InCl(3) with PEt(3) and PhP(SiMe(3))(2). In addition to In-P bonds, the cage has In-In and P-P bonds. Six terminal chloro ligands and three PEt(3) ligands surround the cluster core which itself encloses a central chloride anion.
 
Article
An exceptionally stable 1:2 complex [FeL(2)](3-) is formed from the ligand H(3)L and Fe(III). In contrast, the affinity of this ligand for other biometals is relatively small. These properties make H(3)L a highly promising candidate for medical applications (e.g. for the treatment of iron overload).
 
Article
(Figure Presented) What expression best conveys the recent examples of "aqueous" organocatalyzed aldol reactions? It is suggested that a reaction occurs "in water" if the participating reactants are dissolved homogeneously in water (or buffer), or "in the presence of water" if it proceeds in a concentrated organic phase with water present as a second phase that influences the reaction in the former.
 
Article
A "naked" aluminum atom links two aluminum tetrahedra in the [Al(7){N(SiMe(3))(2)}(6)](-) ion (see picture), which results from the reaction of a metastable AlCl solution with LiN(SiMe(3))(2) and crystallizes with [Li(OEt(2))(3)](+) as cation. This unique structure among molecular metal atom clusters represents a small but characteristic section of cubic close-packed aluminum.
 
Article
Into the crypt: Direct coupling of cyclotrithiophenolene gives a new class of cryptophane with labile disulfide linkages, which is the smallest cryptophane yet reported. The new cryptophane (see structure, S yellow, C gray, H light gray) is shown to bind methane or nitrogen in solution.
 
Article
(Graph Presented) Relaxation time: Direct profiles of protein 1H relaxation in D2O at mM concentrations were generated by NMR spectroscopy at 0.01-50 MHz (see picture). The study of lysozyme at pH 3.5 (monomeric) and pH 9.0 (dimeric), and of α-synuclein (unfolded), provides direct information on aggregation through estimates of the realignment correlation time and on the overall compactness of the protein.
 
Article
Caught on film: A semitransparent and intensely luminescent monolayer film of oriented Gd(2)O(3):0.05 Eu platelet crystallites is fabricated by annealing the precursor hydroxide film (see scheme). The photoluminescence properties of the as-transformed film are greatly improved over those of the hydroxide film, and are much more pronounced than those of the corresponding Gd(2)O(3):0.05 Eu powder.
 
Article
Ordnung im Chaos: Die antiferromagnetische Titelverbindung wurde unter milden Hydrothermalbedingungen synthetisiert und Mößbauer-spektroskopisch untersucht. Die Eisen(II)- und Eisen(III)-Kationen besetzen unterschiedliche kristallographische Positionen, während die Phosphit- und Hydrogenphosphat/Phosphat-Oxoanionen über zwei Phosphorlagen fehlgeordnet sind (siehe Struktur).
 
Article
Tailoring an electrocatalyst: The synergistic effect of the high catalytic activity and the unique hollow channel structure of the perovskite-based porous La0.75 Sr0.25 MnO3 nanotube electrocatalyst endows the Li-O2 battery with a high specific capacity, superior rate capability, and good cycle stability.
 
Article
In tandem: Employing a molecular dyad and a cobalt-based electrolyte gives a threefold-increase in open-circuit voltage (V(OC)) for a p-type NiO device (V(OC) = 0.35 V), and a fourfold better energy conversion efficiency. Incorporating these improvements in a TiO(2)/NiO tandem dye-sensitized solar cell (TDSC), results in a TDSC with a V(OC) = 0.91 V (see figure; CB = conductance band, VB = valence band).
 
Article
Two from one: It is possible to form two different, interpenetrating polymer structures-silicon dioxide and a phenolic resin-simultaneously in a single step without the formation of by-products by using a readily polymerizable, organic silicon spiro compound. This new polymerization process enables the fabrication of materials with domain sizes of 0.5 to 3 nm.
 
Article
The stoichiometric reduction of the MIL-47(V) framework (see picture; green VO6 octahedra) was performed using cobaltocene as an organometallic reducing agent. The formation of a mixed-valence compound with a V3+/V4+ ratio of 1:1 was confirmed by magnetic susceptibility measurements. Incorporation of cobaltocene into the MIL-47(V) framework can be reversed upon treatment with water.
 
Article
Not quasi-crystalline: approximate five-fold symmetry appears in bronze-type Cu-Sn rods that are separated by Na atoms in Na(2.8)Cu(5)Sn(5.6). The rods are compared to the [Sn@Cu(12)@Sn(20)](12-) cluster in the recently characterized A(12)Cu(12)Sn(21) phases (A=Na-Cs), and a saltlike description in analogy to Zintl phases of p-block metals is introduced for these new polar intermetallic phases with a high d-block metal content.
 
Article
Fixing a hole: Hydrothermal chemistry has been exploited in the preparation of a 3D framework material exhibiting 48% accessible void volume and 1.5% hydrogen uptake by weight at 120 kPa (see picture). The title compound also exhibits single-chain magnetic behavior and reversible changes in magnetic properties upon solvation and desolvation.
 
Article
Opening up closo-cluster chemistry: The first representative of the seven-vertex closo monocarbaborane series, the [closo-2-CB 6H 7] - ion (see structure), was isolated together with the [closo-1-CB 7H 8] - ion from simple reactions between nido-1-CB 8H 12 and Et 3N. Both ions exhibit high stability in air and are potentially useful for weakly coordinating anion chemistry.
 
Article
A cerious contender: The catalytic activity in the water gas shift reaction of Au and Cu nanoparticles supported on CeO2(111) is superior to that of these nanoparticles on a ZnO(0001) support or of the bulk metals (the diagram shows the results depending on the Au nanoparticle coverage). These results illustrate the essential role that an oxide can have in the activity of supported Au nanocatalysts. (Graph Presented).
 
Article
(Figure Presented) Lots of writing on the wall: A simple and flexible approach for performing high-throughput, large-area, direct-write molecular patterning, without tip feedback, is demonstrated by using a 55 000-pen two-dimensional array of atomic force microscope (AFM) cantilevers. The use of low-aspect-ratio pyramidal tips, curved cantilevers, and a novel gravity-driven alignment method allows parallel patterning of molecules across 1-cm2 substrate areas at sub-100-nm resolution.
 
Article
A great film with special effects: An epitaxial Pt thin film with a thickness of 1.5 nm on a TaB2 (0001) substrate (see high-angle annular dark-field STEM image) was tested as an electrocatalyst for the oxygen reduction reaction. Its specific activity was twice that observed for polycrystalline Pt or Pt(111). Analysis and DFT calculations showed that the Pt layer is alloyed with Ta, the electronic effect of which on Pt leads to the enhanced activity.
 
Article
Acidic water: The first monolayer of water on a Ru(0001) surface is anomalously acidic compared to bulk water, according to infrared and mass spectroscopic investigations of the water layer using ammonia as a probe for surface acidity. The observation suggests that acid-base chemistry may be quite different at the water-metal interfaces than in aqueous solution.
 
Article
Hydroxy-mediated methoxy formation or stabilization is probably an important process in many methanol adsorption systems. Hydrogen atoms originating from the scission of the methanol O-H bond react with the substrate and form water. This process may result 1) in the production of additional surface defects as reactive centers for methoxy formation and 2) in the stabilization of methoxy groups by suppression of methanol formation.
 
Article
The addition of nitrenes, nucleophilic carbenes, and radicals affords soluble, individual single-walled nanotubes (shown here is a carbene-functionalized adduct) by covalent sidewall functionalization. The characterization, a fundamental problem in nanotube chemistry, is simple to carry out.
 
Article
Ein Platin-Cyclopropylcarben-Komplex, der, wie im Schema gezeigt, durch anti-Angriff eines Furanrestes an einen Platin-(η2-Alkin)-Komplex gebildet wird, ist das Schlüsselintermediat bei der intramolekularen Reaktion von Furanen mit Alkinen – so das Ergebnis von experimentellen und Dichtefunktional-Untersuchungen.
 
Top-cited authors
Wolfgang A. Herrmann
  • Technische Universität München
Hartmuth C Kolb
  • Johnson & Johnson
Frank Glorius
  • University of Münster
Peter Wasserscheid
  • Friedrich-Alexander-University of Erlangen-Nürnberg
Jean-Marie Lehn
  • University of Strasbourg