Cover Picture: Tetrameric ααββ Aggregate Formation by Stereoisomeric Bidomain Helicene Oligomers (Angew. Chem. Int. Ed. 20/2013)

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Abstract

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Tetrameric aggregates with an ααββ structure are formed by a method using stereoisomeric bidomain oligomers for the α- and β-subunits, as described in the Communication on page 5290 ff. by M. Yamaguchi et al‥ Mixing the dimeric αα and ββ homoaggregates gave tetrameric ααββ heteroaggregates without formation of higher and lower aggregates. The tetrameric aggregate reversibly changed its structure between the dimeric homoaggregates on heating and cooling, and gelation occurred in toluene by polymerization.

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Tetrameric aggregates with an ααββ structure are formed by a method using stereoisomeric bidomain oligomers for the α- and β-subunits, as described in the Communication on page 5290 ff. by M. Yamaguchi et al‥ Mixing the dimeric αα and ββ homoaggregates gave tetrameric ααββ heteroaggregates without formation of higher and lower aggregates. The tetrameric aggregate reversibly changed its structure between the dimeric homoaggregates on heating and cooling, and gelation occurred in toluene by polymerization.

Electrochemistry

In their Communication on page 5248 ff., X. B. Zhang and co-workers report a 3D nickel foam/porous carbon/anodized nickel electrode that was designed for the oxygen evolution reaction.

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Helical Chirality

A π-conjugated polymer forms a unique one-handed double helix in the presence of chiral amines, which are sandwiched by the polymer strands, as described by E. Yashima et al. in their Communication on page 5275 ff.

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Enzyme Model

In their Communication on page 5398 ff., S. Herres-Pawlis, T. D. P. Stack, and co-workers describe a copper complex that can hydroxylate various phenols by using dioxygen. The mechanism is analogous to that of the tyrosinase-catalyzed reaction.

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Ancillary