Silver(I) complexes of dibenzo-18-crown-6-ether having cation–π and π–π interactions

Three silver(I) complexes of dibenzo-18-crown-6-ether (DB[18]C6), [Ag(DB[18]C6)(ClO4)](THF) (1), [Ag(DB[18]6)(CF3SO3)]2(acetone)2 (2) and [Ag(DB[18]C6)(CF3COO)]2(AgCF3COO)2 (3) have been synthesized in different solvents and characterized structurally. In each complex, silver ions prefer an octahedral coordination geometry and form close dinuclear complex with DB[18]C6 based on cation–π interaction in η2-fashion. In particular, the coordination unit involving σ bonding at an oxygen group and π–π bonding between two benzene rings is quite unique.