Supramolecular coordination chemistry

Omary M.A., Mohamed, A.A., Rawashdeh-Omary, M.A. and Fackler, J.P. Jr (2005) Photophysics of supramolecular binary stacks consisting of electron-rich trinuclear Au(I) complexes and organic electrophiles. Coordination Chemistry Reviews, 249, 1372-1381. 

As described most elegantly elsewhere in this volume, the halogen bond is an intermolecular, charge-transfer interaction between a Lewis base and an electron-deficient halogen. Other chapters that accompany this chart its use in, for example, supramolecular chemistry, molecular conductors and coordination chemistry. In this chapter, a much more recent application of halogen bonding is described, namely in the realisation of liquid-crystalline materials. 

Seeber G, Tiedemann BEF, Raymond KN (2006) Supramolecular Chirality in Coordination Chemistry. 265 147-184... 

N. C. Gianneschi, M. S. Masar, and C. A. Mirkin, Development of a coordination chemistry-based approach for functional supramolecular structures, Acc. Chem. Res., 38 (2005) 825-837. 

In the present volume, our intention was to cover several modern approaches to phosphorus chemistry which were not, or at least not completely, covered in the previous volumes. The selected topics are expected to have broader relevance and to be interesting to a more general readership, since key aspects of phosphorus chemistry are pointed out. Indeed, several fields are investigated coordination chemistry, catalysis, supramolecular chemistry, biochemistry, hybrid organic-inorganic materials, new ambiphilic ligands, and biology. 

Pyridinedicarboxylic acid (dipicolinic acid) is a widely used building block in coordination and supramolecular chemistry. The crystal stractrrre of dipicolinic acid was first solved in 1973, which confirmed its molectrlar formtrla of C7H5NO4, a molar mass of 167.119 g mol , and the resrrlting composition of its constituent atoms (C, 50.31% H, 3.02% N,... 

Pyridinedicarboxylie acid (dipicolinic acid) is definitely an excellent building block in coordination and supramolecular chemistry as outlined above. 

As Figure 3 illustrates, redox active guests introduce PET processes almost by definition and luminescent on-off switching is the norm. However, the inhibitions outlined in Section 5 have not prevented the designers of switchable luminescent devices from exploring systems which bind redox active guests. The combined forces of inorganic coordination chemistry and supramolecular science have proved to be too attractive in many of these instances. It is to be hoped that some of this effort will filter across to the examination of more on-off systems like 17 and 18. 

Supramolecular chemistry has thus developed into a coherent and extremely lively body of concepts and objects, progressively generating and incorporating novel areas of investigation. A whole vocabulary, still incomplete however, has been developed and has become more and more widely accepted and used. Some of the names have been borrowed and adapted from other existing fields, in particular coordination chemistry and biology. 

Regarding the liquid/liquid extraction from the metal standpoint is rather different. This is the classical approach of coordination chemistry (most of the publications in this area). Today, it is still difficult to establish a direct link between the two descriptions of the organic extractant phases. To better understand liquid/ liquid extraction, the aggregation number and coordination number must be measured separately for each system and set of initial conditions. This is the only way to determine the role of the aggregates in the extraction efficiency. This important point was emphasized by Yaita et al. (61). In this way, Gannaz et al. has used an approach combining studies on both supramolecular and molecular speciation of extractant systems of the DIAMEX-SANEX process (36). 

Catherine E. Housecroft was born in Bradford (UK) and studied at the University of Durham where she obtained a BSc (1976) and PhD (with Ken Wade, 1979) in chemistry. After a postdoctoral period with Tom Fehlner (University of Notre Dame), she was an Assistant Professor at the University of New Hampshire before moving to the University of Cambridge (Fellow of Newnham College), where she held a Royal Society University Research Fellowship before becoming a University Lecturer. In 1993, she moved to the University of Basel where (apart from two years at Birmingham University) she has remained and is currently a Professor of Chemistry. Research interests span organome-tallic, coordination and supramolecular chemistries. In addition to over 250 research publications and reviews, she is the author of a number of textbooks. She is also an editor of Polyhedron and has been a volume editor both for COMCII and COMCIII. 

Metallodendrimers can be of supramolecular construction [116] (see Section 2.6), formed by metal/ligand complexation (coordination chemistry), or also produced by covalent bonding. 

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