THE COMPLEX FORMATION OF alpha, omega-DICARBOXYLIC ACIDS AND alpha, omega-DIOLS WITH CUCURBITURIL AND alpha-CYCLODEXTRIN. THE FIRST STEP TO THE FORMATION OF ROTAXANES AND POLYROTAXENES OF THE POLYESTER TYPE
Hans-Jürgen Buschmann, Klaus Jansen and Eckhard Schollmeyer
Deutsches Textilforschungszentrum Nord-West e.V., Frankenring 2, D-47798 Krefeld, Germany
The formation of mechanically bound molecules in relative high yields is only possible if preorganized molecules are used. Thus, the complex formation between a,w-dicarboxylic acids and a,w-diols and the macrocyclic ligands cucurbituril and a-cyclodextrin was examined using calorimetric titrations. Both ligands are able to form relative strong complexes with the molecules examined. However, for the formation of rotaxane-polyesters it is essential that the reactive groups of the complexed molecules are located outside of the cavities of the preorganized complexes.