Dinuclear silver(I) complexes of dibenzo-crown ethers and the mononuclear complex of aminobenzo-crown ether
摘要:
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(l) ions are situated in a distorted pentagonal pyramidal geometry and form close dinuclear complex with DB[21]C7 based on cation-pi interaction in eta(2)-fashion. This coordination unit involves sigma bonding at a part oxygen atoms of ligand oxygen base cavity and pi-pi interaction between two parallel phenyl groups. But in 3, each DB[24]C8 host contained two silver(l) ions as guest without cation-pi and pi-pi interaction. (C) 2002 Elsevier Science B.V.. All rights reserved.