Calixarenes cage-type molecules

Many complex P/C cages are to be found amongst metaUophosphorus compounds (Chapter 8). 6.22.2 Calixarene-Type Molecules... 

Encapsulation of the and ions by cage-type ligands was also achieved using functionalized calixarenes. Metal luminescenee properties were studied mostly for complexes of calix[4]arenes, while few results are available for complexes of calix[6]arenes and calix[8]arenes, the latter being dinuclear complexes. Figure 13 shows schematically the calixarene ligands of the Eu and Tb complexes examined. Some photophysical data and the number of coordinated solvent molecules of these complexes are gathered in table 4. 

Metalated container molecules can be viewed as a class of compounds that have one or more active metal coordination sites anchored within or next to a molecular cavity (Fig. 2). A range of host systems is capable of forming such structures. The majority of these compounds represent macrocyclic molecules and steri-cally demanding tripod ligands, as for instance calixarenes (42), cyclodextrins (43,44), and trispyrazolylborates (45-48), respectively. In the following, selected types of metalated container molecules and their properties are briefly discussed and where appropriate the foundation papers from relevant earlier work are included. Porphyrin-based hosts and coordination cages with encapsulated metal complexes have been reviewed previously (49-53) and, therefore, only the most recent examples will be described. Thereafter, our work in this field is reported. 

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