Angewandte Chemie International Edition

Cover image for Vol. 53 Issue 48

Editor: Peter Gölitz, Deputy Editors: Neville Compton, Haymo Ross

Online ISSN: 1521-3773

Associated Title(s): Angewandte Chemie, Chemistry - A European Journal, Chemistry – An Asian Journal, ChemistryOpen, ChemPlusChem, Zeitschrift für Chemie

53_48/2014Cover Picture: Development of Double-Perovskite Compounds as Cathode Materials for Low-Temperature Solid Oxide Fuel Cells (Angew. Chem. Int. Ed. 48/2014)

Double-perovskite compounds are described by G. Kim and co-workers in their Communication on page 13064 ff. as a new class of cathode materials for solid oxide fuel cells. The enhanced stability of NdBa0.75Ca0.25Co2O5+δ can be ascribed to both the increased electron affinity of mobile oxygen species and the increased redox stability induced by Ca doping into the A site of NdBaCo2O5+δ.

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Also of Interest

Double-perovskite compounds are described by G. Kim and co-workers in their Communication on page 13064 ff. as a new class of cathode materials for solid oxide fuel cells. The enhanced stability of NdBa0.75Ca0.25Co2O5+δ can be ascribed to both the increased electron affinity of mobile oxygen species and the increased redox stability induced by Ca doping into the A site of NdBaCo2O5+δ.

Water Oxidationfor001

In their Communication on page 13042 ff., Z.-F. Ke, T.-B. Lu, and co-workers report a nickel-based homogeneous catalyst for water oxidation. This catalyst can efficiently electrocatalyze water oxidation at neutral pH in phosphate buffer.


Liquid Crystalsfor002

Two types of liquid-crystalline phases consisting of two or three networks are presented by X. Zeng, G. Ungar, C. Tschierske et al. in their Communication on page 13115 ff. The three-network phase displays permanent chirality even though the constitutive molecules are achiral.


Boride Magnetsfor003

B. P. T. Fokwa et al. report in their Communication on page 13174 ff. a mutual dependency between ferromagnetic iron chains and stacked B6 rings (see picture) found in the new ferromagnetic material, Nb6Fe1−xIr6+xB8.


53_48i/2014Inside Cover: Catalytic Asymmetric Functionalization of Aromatic C-H Bonds by Electrophilic Trapping of Metal-Carbene-Induced Zwitterionic Intermediates (Angew. Chem. Int. Ed. 48/2014)

An asymmetric three-component reaction of N,N-disubstituted anilines, diazo compounds, and imines is catalyzed by RhII and a chiral phosphoric acid and affords α,α-diaryl benzylic quaternary stereocenters. In their Communication on page 13098 ff., W. Hu, D. Xing et al. report this functionalization of aromatic C-H bonds with diazo compounds, which they compare with a “magic tea pot” that allows the mixing of three different tea bags into a wonderful tea.

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53_48c/2014Inside Back Cover: Dynamic Mirror-Symmetry Breaking in Bicontinuous Cubic Phases (Angew. Chem. Int. Ed. 48/2014)

Two thermotropic bicontinuous cubic liquid-crystalline phases containing three or two networks were discovered. The triple-network phase displays a previously undiscovered feature: it is always strongly optically active even though the constitutive compound is achiral. In contrast, the “double gyroid”, containing only two networks, has no optical activity. As X. Zeng, G. Ungar, C. Tschierske et al. propose in their Communication on page 13115 ff., only in the double gyroid the opposing induced chiralities cancel out, while in the triple-network net chirality inevitably persists.

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53_48b/2014Back Cover: Unexpected Synergy between Magnetic Iron Chains and Stacked B6 Rings in Nb6Fe1−xIr6+xB8 (Angew. Chem. Int. Ed. 48/2014)

Planar boron rings were predicted some years ago by scientists studying gas-phase boron clusters as building blocks for designing new molecular and solid-state materials. In their Communication on page 13174 ff., B. P. T. Fokwa et al. report experiments and density functional calculations used in a synergistic manner for the discovery of the new ferromagnetic material, Nb6Fe1−xIr6+xB8 (Tc=350 K), containing in its crystal structure iron chains embedded in stacked B6 rings.

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