title: Long-range magnetic coupling through extended pi-conjugated aromatic bridges in dinuclear copper(II) metallacyclophanes.
abstract: Self-assembly of 1,4-phenylenebis(oxamate) and 4,4'-biphenylenebis(oxamate) ligands and Cu2+ ions gives two new dinuclear copper(II) metallacyclophanes where the two metal centers are connected by double para-substituted aromatic diamide bridges. Despite the relatively large intramolecular Cu-Cu distance of ca. 8 and 12 A for each complex, magnetic susceptibility measurements evidence strong to moderately strong intramolecular antiferromagnetic couplings (-J values of the order of 100 and 10 cm-1, respectively). Density functional theory calculations on these compounds and their homologues with linear oligo-p-phenylenediamide bridges predict a rather slow exponential decay of magnetic coupling with increasing intermetal distance (r values up to 25 A) along this novel series of dicopper metalla-amidocyclophanes.
authors.affiliation: Departament de Química Inorgànica, Instituto de Ciencia Molecular, Facultat de Química, Universitat de València, 46100 Burjassot, València, Spain.
authors.forename: Emilio
authors.initials: E
authors.lastname: Pardo
authors.forename: Juan
authors.initials: J
authors.lastname: Faus
authors.forename: Miguel
authors.initials: M
authors.lastname: Julve
authors.forename: Francesc
authors.initials: F
authors.lastname: Lloret
authors.forename: M Carmen
authors.initials: MC
authors.lastname: Muñoz
authors.forename: Joan
authors.initials: J
authors.lastname: Cano
authors.forename: Xavier
authors.initials: X
authors.lastname: Ottenwaelder
authors.forename: Yves
authors.initials: Y
authors.lastname: Journaux
authors.forename: Rosa
authors.initials: R
authors.lastname: Carrasco
authors.forename: Gonzalo
authors.initials: G
authors.lastname: Blay
authors.forename: Isabel
authors.initials: I
authors.lastname: Fernández
authors.forename: Rafael
authors.initials: R
authors.lastname: Ruiz-García