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Book Review Frontiers in Supramolecular Organic Chemistry and Photochemistry. Edited by H.-J. Schneider and H. Drr

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of the aim set out in the introduction, which is to give a
selective overview of the field. A similar situation is found
with regard to the choice of material within each chapter. In
every case one could have made a different choice which
would have been at least equally good, and many topics are
only touched on very briefly. For example, in the final chapter there is no mention of the buckminsterfullerenes (C60and
higher homologues),'*' as important forms of interstellar
carbon and constituents of carbon black; however, the
manuscript was in preparation at a time before the critical
voices doubting this interpretation of the then available spectra had been completely silenced, and one can therefore understand the reasons for the omission.
Altogether the book contains such a wealth of stimulating
ideas that the reader whose interest goes deeper is unlikely to
be content with the text itself; the references provide easy
access to material for more detailed study. Thus the book is
a working guide rather than a textbook, and from this standpoint T found it enjoyable reading, and can therefore recommend it for the readership envisaged by the publishers. It
would be useful for university and research institute libraries
to have copies of the book so that it would also be easily
accessible to students.
Ulrich Zenneck
Institut fur Anorganische Chemie
der Universitat Erlangen-Nurnberg (FRG)
Frontiers in Supramolecular Organic Chemistry and Photochemistry. Edited by H.-J. Schneider and H . Diirr. VCH
Verlagsgesellschaft, Weinheim/VCH Publishers, New
York, 1991. xii, 485 pp., hardcover DM 196.00.--ISBN 3527-28016-210-89573-951-8
This book contains twenty articles which, except for the
chapters written by the two editors, are based on papers
presented at the Workshop on Supramolecular Organic
Chemistry and Photochemistry which took place at the end
of August 1989 in Saarbriicken, Germany. The main focus of
interest here lies not in the individual molecules but in the
association of molecules. The activities of the individual research groups in the area of supramolecular chemistry are
aimed not only at gaining a deeper understanding of biological systems but also, most importantly, at developing new
materials and technologies. In this book (p. 25) Lehn defines
the goal as: ". . . strategies toward properties and functions
rather than toward structures.. .". The topics covered in this
book are concerned with both aspects: they range from the
design of ligands and their synthesis, and a description of the
formation of complexes containing these ligands, through to
the photochemistry of biological systems. The arrangement
of the book's contents also essentially follows this pattern.
In the first chapter (pp. 1-28) Jean-Marie Lehn reviews
the work of his group, from the start of their investigations
of molecular recognition through studies of structures with
electronic and ionic conductivity up to work on information
and signal processing and molecular self-organization. This
is followed by a series of chapters dealing with problems of
host-guest interactions, as follows : selectivity and complementarity in molecular recognition, Schneider, pp. 29- 56 ;
receptors of the calixarene type, Ungaro, pp. 57-82; metallomacrocycles as host compounds for neutral guests, Rein
See J. F. Stoddart. Angew. Chem. 1991, 103, I t -12; Angew. Chem. In(. Ed.
1991. 30. 70-71.
Angew. ChPm. Inr. Ed. Engl. 31 (1992) No. 3
houdt, pp. 83-108; the design and synthesis of a biotin receptor, determination of association constants in host-guest
complexes, Wilcox, pp. 123-144; azacyclophanes, Murakami, pp. 145-166. The main emphasis is also on synthesis in Stoddart's contribution (pp. 251 -264); here, however,
in catenanes and rotaxanes one is dealing with noncovalent
bonding of a different kind.
Czarnik and Diederich describe some real applications.
Czarnik (pp. 109- 122) uses changes in the fluorescence
properties as a method of analysis in the formation of chelates
by anthracene derivatives, while Diederich (supramolecular
catalysis, pp. 167- 192) has not only used his cyclophanes for
binding substrates but has also developed them into catalysts, e.g. for the condensation of benzoin or for the oxidation of aromatic aldehydes.
In the second part of the book the discussion of supramolecular systems is extended beyond host-guest complexes,
which are made up of only a few molecules, to micelles,
vesicles, membranes and various other systems, many of
which have liquid crystalline properties. The topics dealt
with are helical clathrates formed by inclusion in amylose
(Hui, pp. 203 -222), transport through channel-containing
membranes (Menger, pp. 193-202), and self-organizing
membranes (Fuhrhop, pp. 223 -250).
The final part of the book deals with photochemistry in
supramolecular structures, i.e. with those photochemical
and photophysical properties that distinguish supramolecular structures from the individual molecules of which they
are formed. The discussion is mainly concerned with fluorescence and electron transfer phenomena. The ultimate objectives of these studies, for example economically viable processes for the photochemical breakdown of water or the
fixing of CO, or nitrogen in nonbiological systems, are
still far from being attained. These contributions should
therefore be regarded as more in the nature of progress reports.
In the area of photochemistry the systems discussed again
include complexes made up of a small number of molecules,
but also in addition liquid crystals, micelles and biological
materials. Thus the topics covered include the photochemistry and photophysics of anthraceno-crown ethers (BouasLaurent, pp. 265-286) and of ion pairs and coordination
compounds (Balzani, pp. 371 -392). Schaffner discusses the
photophysics and photochemistry of the biliprotein chromophore with regard to its protein matrix (pp. 421 -452).
Ringsdorf describes the photoinduced structural changes
that occur in some organized supramolecular systems, most
of which are liquid crystalline (pp. 311 -336), and Willner
deals with photoinduced electron transfer in systems of this
type (pp. 337-370), whereas Braun discusses oxidation reactions in microheterogeneous media (pp. 393-420). De
Schryver describes the use of fluorescence measurements for
characterizing micelles. The photochemical part concludes
with a chapter on supramolecular photosensitizers (based on
ruthenium) for nonbiological photosynthesis (Diirr,
pp. 453-476).
Altogether this book is an excellent collection of papers
from the Saarbrucken Workshop, and it summarizes the latest developments in a number of different areas that come
under the general heading of supramolecular chemistry. The
layout of the text is clear and systematic, and there are plenty
of figures, some of which are in color. Regrettably, however,
the high price will be an obstacle to reaching a large readership.
Ulrich Liining
Institut fur Organische Chemie und Biochemie
der Universitat Freiburg (FRG)
mbH. W-6940 Weinheim, 1992
0570-0833/92/0303-0363$3.50+ .25/0
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chemistry, photochemistry, drr, book, organiz, supramolecular, edited, frontiers, review, schneider
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