Three-Component Entanglements Consisting of Three Crescent-Shaped Bidentate Ligands Coordinated to an Octahedral Metal Centre

摘要

3,3'-Biisoquinoline ligands(biiq)L,bearing aromatic substituents on their 8 and 8' positions,have been used to generate interwoven systems consisting of three crescent-shaped ligands disposed around an octahedral metal centre.Mono-ligand complexes of the type [ReL(CO)3py]~+(py:pyridine)have also been prepared,leading to sterically non-hindering complexes in spite of the endotopic nature of the chelate used.The three-component entanglements have been prepared by using either Fe~(II)or Ru~(II)as gathering metal centre.The synthetic procedure is simple and efficient,affording fully characterised complexes as their PF6 or SbCl6 salts.X-ray crystallography clearly shows that the crescent-shaped ligands do not repel each other in the tris-chelate complexes.In an analogous way,the Re~I complexes show open structures with no steric repulsion between the L ligand and the ancillary CO or py groups.The FeL3 or RuL3 compounds are very unusual in the sense that,contrary to all the other tris-bidentate chelate complexes made till now,the three organic components are tangled up,in a situation which will be very favourable to the formation of new non trivial topologies of the cate-nane type.