(Dibenzo-18-crown-6)(2-phenylamidopyridine)-potassium(I)

The title complex, [Rb(C11H9N2)(C20H24O6)], has potassium in an irregular eightfold coordination, with a hexadentate crown ether ligand and a chelating bidentate amidopyridine ligand, each occupying one hemisphere of the coordination. The chelate KNCN ring is slightly folded, and the two rings of the amidopyridine ligand are not coplanar, because of steric interaction of H atoms on the rings. The K - N(amido) bond is shorter than the K-N(pyridine) bond. The coordination of the crown ether to potassium is less symmetrical than that for the analogous rubidium complex, reflecting a poorer size match for K+ in this coordination site.