Abstract
A series of Ag+ complexes of the macrocyclic heteroditopic receptor, 4-phenylurea-benzo-15-crown-5 (1) have been prepared from hydrophobic- (,) and oxo- (, ) anion salts. These complexes contain the Ag+ cation, partially interacting with the macrocyclic cavity and the anions H-bonded to urea moieties. Additional interactions of the Ag+ cation with a –C = O moiety of a neighbouring receptor 1 molecule or with the oxo-anions (, ) have been observed. Kass values calculated for the resulted ion-pair macrocyclic complexes , , , were fitted with 1:1 model and correspond to the values of 140, 255, 660 and 980 M− 1, respectively. The cooperative anion/urea and cation/macrocycle binding and their interaction favour the whole recognition process. This synergism is amplified by self-assembly and depends on the structural features of the anion. In the combined system, the cation–anion interactions are favourable for the stability of the whole system.
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