Ion-Pairing Assemblies of Porphyrin-AuIII Complexes in Combination with π-Electronic Receptor-Anion Complexes.

Anion complexes of anion-responsive π-electronic molecules can behave as pseudo π-electronic anions providing various ion pairs in combination with countercations. In this study, single crystals of ion-pairing assemblies comprising porphyrin-AuIII complexes and Cl- complexes of dipyrrolyldiketone BF2 complexes were prepared from 1:1 mixtures of anion receptors and the Cl- salts of cationic porphyrins in solution. In the solid state, the ion pairs formed characteristic assemblies, depending on the substituents of the anion receptors and porphyrin-AuIII complexes. Theoretical calculations on the ion pairs revealed that the stacking structures are stabilized by compensating positive and negative charges as well as π-π interactions.