Dinuclear silver(I) complexes of dibenzo-crown ethers and the mononuclear complex of aminobenzo-crown ether

Three silver(I) coordination complexes of crown ethers, [Ag([15]C6)(ClO4)2](THF) (1), [Ag(DB[21]C7)(H2O)]2(ClO4)2 (2) and [Ag(DB[24]C8)(CF3SO3)]2(acetone)2 (3) have been synthesized in different solvents and characterized structurally. The mononuclear complex 1 and two different dinuclear complexes 2 and 3 are shown in this work. Silver(I) ions are situated in a distorted pentagonal pyramidal geometry and form close dinuclear complex with DB[21]C7 based on cation–π interaction in η2-fashion. This coordination unit involves σ bonding at a part oxygen atoms of ligand oxygen base cavity and π–π interaction between two parallel phenyl groups. But in 3, each DB[24]C8 host contained two silver(I) ions as guest without cation–π and π–π interaction.