title: Three-component entanglements consisting of three crescent-shaped bidentate ligands coordinated to an octahedral metal centre.
abstract: 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 FeII or RuII 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 ReI 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 catenane type.
authors.affiliation: Laboratoire de Chimie Organo-Minérale, Institut de Chimie, Université Louis Pasteur, 4 rue Blaise Pascal, 67070 Strasbourg Cedex, France.
authors.forename: Fabien
authors.initials: F
authors.lastname: Durola
authors.forename: Luca
authors.initials: L
authors.lastname: Russo
authors.forename: Jean-Pierre
authors.initials: JP
authors.lastname: Sauvage
authors.forename: Kari
authors.initials: K
authors.lastname: Rissanen
authors.forename: Oliver S
authors.initials: OS
authors.lastname: Wenger
mesh_terms: D018360:Crystallography, X-Ray; D057927:Hydrophobic and Hydrophilic Interactions; D007501:Iron / Q000737:chemistry*; D008024:Ligands; D008958:Models, Molecular; D008968:Molecular Conformation; D015394:Molecular Structure; D009942:Organometallic Compounds / Q000138:chemical synthesis / Q000737:chemistry*; D011804:Quinolines / Q000737:chemistry*; D012428:Ruthenium / Q000737:chemistry*
chemical_list: D008024:Ligands; D009942:Organometallic Compounds; D011804:Quinolines; D012428:Ruthenium; D007501:Iron