METAL-CONTROLLED AGGREGATION-DEAGGREGATION IN CALIX[4]ARENE-BASED SELF-ASSEMBLIES

Supramolecular self-assemblies of complementary components 1 or 2 (cal ix[4]arene derivatives with two or four 2,6-diaminopyridine units, res pectively) and 3 (5,5-dialkyl barbituric acids) in chloroform-acetonit rile solution were confirmed by H-1 NMR spectroscopy and light scatter ing. While derivative 1 interacts with 3 only after addition of Na+ ca tion, which disrupts intramolecular hydrogen bonds, compound 2 creates a complex with 3 even without the presence of Na+ cation, indicating much weaker intramolecular bonds in this derivative.