Angewandte Chemie International Edition

Cover image for Vol. 54 Issue 5

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

54_05/2015Cover Picture: Magnetic Memory in an Isotopically Enriched and Magnetically Isolated Mononuclear Dysprosium Complex (Angew. Chem. Int. Ed. 5/2015)

The quantum tunneling in a mononuclear Dy-based single-molecule magnet (SMM) can be drastically reduced, improving the capability of the molecule to store magnetic information. As O. Cador and co-workers show in their Communication on page 1504 ff, this improvement is brought about by using isotopes of DyIII that do not have a nuclear magnetic moment and by dilution of the SMM in a diamagnetic matrix. Combined, these strategies lead to the opening of the hysteresis loop in zero field, and the relaxation time is increased.

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Also of Interest

The quantum tunneling in a mononuclear Dy-based single-molecule magnet (SMM) can be drastically reduced, improving the capability of the molecule to store magnetic information. As O. Cador and co-workers show in their Communication on page 1504 ff, this improvement is brought about by using isotopes of DyIII that do not have a nuclear magnetic moment and by dilution of the SMM in a diamagnetic matrix. Combined, these strategies lead to the opening of the hysteresis loop in zero field, and the relaxation time is increased.

Electron Transferfor001

Extracellular electron transfer from living microbes can be regulated by altering the surface wettability of the electrode. In their Communication on page 1446 ff., H. Liu, Y. Zhu, et al. report that the electron transfer activity on a hydrophilic electrode is more than five times higher than that on a hydrophobic one.


Iminoborane Adductsfor002

Carbene–iminoborane adducts are structural and isoelectronic congeners of the conventional imine functional group. H. Braunschweig and co-workers describe the reactions of these compounds in their Communication on page 1662 ff.


Zeolite Catalystsfor003

Positron annihilation lifetime spectroscopy is used to probe pore connectivity of zeolites. A direct correlation with catalyst longevity in the conversion of methanol to hydrocarbons was observed by J. Pérez-Ramírez et al. in their Communication on page 1591 ff.


54_05i/2015Inside Cover: Quantitative Trace Analysis of Complex Mixtures Using SABRE Hyperpolarization (Angew. Chem. Int. Ed. 5/2015)

Quantitative trace analysis by NMR spectroscopy is feasible with a nuclear spin hyperpolarization method, namely signal amplification by reversible exchange (SABRE), as described by M. Tessari and co-workers in their Communication on page 1481 ff. SABRE was combined with the standard-addition method to determine concentrations of dilute analytes in complex mixtures.

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54_05c/2015Inside Back Cover: The Reactivities of Iminoboranes with Carbenes: BN Isosteres of Carbene–Alkyne Adducts (Angew. Chem. Int. Ed. 5/2015)

The reactions of imino boranes and singlet carbenes display expected as well as unexpected rectivity patterns. In their Communication on page 1662 ff., H. Braunschweig and co-workers report the formation of an iminoborane–carbene Lewis acid–base adduct, an aminoborane-functionalized carbene, and a bicyclic azaborolidine from the reactions of three different carbenes with the same iminoborane.

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54_05b/2015Back Cover: Impact of Pore Connectivity on the Design of Long-Lived Zeolite Catalysts (Angew. Chem. Int. Ed. 5/2015)

The unique sensitivity of positron annihilation lifetime spectroscopy to subtleties in the pore connectivity of hierarchically structured MFI zeolites reveals the direct correlation with the catalyst longevity in the conversion of methanol to hydrocarbons, as shown by J. Pérez-Ramírez et al. in their Communication on page 1591 ff. Artwork: concept A. Gallardo, illustration M. Reich.

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