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18.447 Aktuelle Fachpublikationen in Angewandte Chemie International Edition

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Asymmetric Three-Component Inverse Electron-Demand Aza-Diels-Alder Reaction: Efficient Synthesis of Ring-Fused Tetrahydroquinolines

14.04.2010 | Mingsheng Xie, Xiaohong Chen, Yin Zhu, Bo Gao, Lili Lin, Xiaohua Liu, Xiaoming Feng, Angewandte Chemie International Edition, 2010

Diels or no Diels: The titled reaction of aldehydes, anilines, and cyclopentadiene, promoted by 0.5-5 mol % of an N,N[prime]-dioxide-scandium complex, afforded ring-fused tetrahydroquinolines that contained three contiguous stereocenters. The one-pot reaction delivers the products with good ...

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Double-Helical Silicon Microtubes

12.04.2010 | Haruhiko Morito, Hisanori Yamane, Angewandte Chemie International Edition, 2010

A new twist on semiconductors: The evaporation of Na from ionic intermetallic NaSi at 800 °C leads to the formation of double-helical silicon microtubes. The tubes have nanogranular or smooth surfaces and a twinned structure with voids in the tube wall. A mechanism is proposed for the ...

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Insight into the Mechanism of the Ru2+-Ru3+ Electron Self-Exchange Reaction from Quantitative Rate Calculations

09.04.2010 | Harald Oberhofer, Jochen Blumberger, Angewandte Chemie International Edition, 2010

The distance dependences of all electron-transfer parameters, including electronic coupling, are computed for the Ru2+-Ru3+ electron self-exchange reaction in aqueous solution. It is found that the probability for electron exchange is a maximum a Ru2+-Ru3+ distance of 5.6 Å (see free-energy ...

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Dilution-Induced Self-Assembly of Porphyrin Aggregates: A Consequence of Coupled Equilibria

08.04.2010 | Floris Helmich, Cameron C. Lee, Marko M. L. Nieuwenhuizen, Jeroen C. Gielen, Peter C. M. Christianen, Antje Larsen, ..., Angewandte Chemie International Edition, 2010

Piggy-back porphyrins: The presence of a Lewis base affects the cooperative self-assembly of zinc porphyrins remarkably. Driven by the susceptibility of the monomer towards the axial ligand, monomer scavenging caused depolymerization of porphyrin aggregates, and dilution caused aggregation by a ...

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Steric Isotope Effects in a Supramolecular Host-Guest System

08.04.2010 | Jeffrey S. Mugridge, Robert G. Bergman, Kenneth N. Raymond, Angewandte Chemie International Edition, 2010

Kinetic isotope effects are observed in the guest exchange process in a supramolecular host-guest system. As reported by J. S. Mugridge, R. G. Bergman, and K. N. Raymond in their Communication (DOI: ), deuteration of the guest molecule results in up to an 11% increase in the rate of guest ...

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Carbon-Nanotube-Array Double Helices

07.04.2010 | Qiang Zhang, Meng-Qiang Zhao, Dai-Ming Tang, Feng Li, Jia-Qi Huang, Bilu Liu, Wan-Cheng Zhu, Ying-Hao Zhang, Fei Wei, Angewandte Chemie International Edition, 2010

Let's twist: Levo- or dextrorotatory carbon-nanotube (CNT) arrays are twisted into a double helix (see picture) on a layered double hydroxide flake through a self-organization process during growth by chemical vapor deposition. The as-grown CNT arrays in the double helix are able to carry a high ...

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Double-Layered Photoanodes from Variable-Size Anatase TiO2 Nanospindles: A Candidate for High-Efficiency Dye-Sensitized Solar Cells

07.04.2010 | Yongcai Qiu, Wei Chen, Shihe Yang, Angewandte Chemie International Edition, 2010

Little and large: A double-layered photoanode constructed from small and large single-crystal anatase TiO2 nanospindles achieves 8.3 % energy-conversion efficiency in a dye-sensitized solar cell (see schematic). One layer of the double-layer structure serves mainly to harbor numerous dye ...

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