In the complex between p -cumylcalix[4]arene and para -xylene [systematic name: 4-(2-phenylisopropyl)calix[4]arene–1,4-dimethylbenzene (1/1)], C 64 H 64 O 4 ·C 8 H 10 , the macrocycle has a cone conformation, which is stabilized by intramolecular hydrogen bonds. The guest para -xylene molecule is situated inside the cavity, giving an endo -calix complex. The host and guest molecules both have twofold rotation symmetry.
Two aspects of the solid state chemistry of calixarenes are presented : in the first part the chlorination of isopropyl and tert-butylcalixarenes is studied, a mechanism is proposed. In the second part the thermal rearrangement of supramolecular systems p-isopropylcalix[4]arene-p-xylene is discussed, the thermal decapsulation of the guest molecules is schematized.
