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Cover Picture Inclusion of Cavitands and Calix[4]arenes into a Metallobridged para-(1H-Imidazo[4 5-f][3 8]phenanthrolin-2-yl)-Expanded Calix[4]arene (Angew. Chem. Int. Ed

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Cover Picture
Enrique Botana, Eric Da Silva, Jordi Benet-Buchholz, Pablo Ballester,
and Javier de Mendoza*
Hunter and hunted is not only a principle of nature but is also found in host–guest
systems. J. de Mendoza and co-workers describe in their Communication on
page 198 ff. how a host molecule (a small calix[4]arene or cavitand) can itself become
the “prey” for a larger host (a metallocavitand made from a calix[4]arene with
[3,8]phenanthroline subunits linked through Re atoms). The cover picture shows the
complexation of a cavitand (by P. Ballester) superimposed on an underwater picture
at Cap Andritxol, Mallorca (by E. Botana).
Renewable Energies
Energy is the most important issue of the 21st century. In their Essay on page 52 ff.,
N. Armaroli and V. Balzani discuss the impending energy crisis and the fundamental
challenges we face both as scientists and as responsible citizens.
Molecular Devices
The underlying principles for the design of synthetic molecular machines is described
by D. A. Leigh and co-workers in their Review on page 72 ff. The progress made
towards utilizing the machines to perform tasks is also highlighted.
Helical Nanotubes
In their Communication on page 194 ff., J. K. M. Sanders and co-workers show that
the helical chirality of nanotubes formed by amino acid derivatives of
naphthalenediimide is determined by the constituent amino acid but is independent of
the nature of the side chains.
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expanded, metallobridged, cali, phenanthroline, imidazo, int, cover, angel, para, chem, arena, inclusion, cavitands, picture, areneв
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