title: Bis-dinuclear (Cu-Gd)2 complexes with a probable helicate structure.
abstract: Two ligands have been designed to simultaneously favour complexation of 3d and 4f metal ions and the formation of helical structures. This synthetic strategy has allowed the isolation of two bis-dinuclear (Cu-Gd)(2) complexes [L(i)(2)Cu(2)Gd(2)(NO(3))(6)] derived from 3-alkoxysalicylaldehyde and 4,4'-diaminodiphenylmethane. The magnetic data shows that both bis-dinuclear complexes behave as two practically independent (Cu-Gd) pairs, each presenting a ferromagnetic interaction (J= 4.6 cm(-1)). Very weak additional antiferromagnetic interactions, probably originating from intra- and/or intermolecular [small pi] stackings, are suggested by the decrease in chiMT below 8 K.
authors.affiliation: Laboratoire de Chimie de Coordination du CNRS, 205 route de Narbonne, F-31077 Toulouse Cedex, France.
authors.forename: Ghenadie
authors.initials: G
authors.lastname: Novitchi
authors.forename: Jean-Pierre
authors.initials: JP
authors.lastname: Costes
authors.forename: Jean-Pierre
authors.initials: JP
authors.lastname: Tuchagues