title: Very long-distance magnetic coupling in a dicopper(II) metallacyclophane with extended π-conjugated diphenylethyne bridges.
abstract: Self-assembly of the rigid rodlike ligand N,N'-4,4'-diphenylethynebis(oxamate) (dpeba) and Cu(2+) ions affords a novel dinuclear copper(II) metallacyclophane (nBu(4)N)(4)[Cu(2)(dpeba)(2)]·4MeOH·2Et(2)O (1) featuring a very long intermetallic distance (r = 15.0 Å). Magnetic susceptibility measurements for 1 reveal a moderately weak but nonnegligible intramolecular antiferromagnetic coupling between the two metal centers across the double para-substituted diphenylethynediamidate bridge (J = -3.9 cm(-1); H = -JS(1)S(2), where S(1) = S(2) = S(Cu) = (1)/(2)). Density functional electronic structure calculations on 1 support the occurrence of a spin polarization mechanism.
authors: Institut de Ciència Molecular (ICMol), Universitat de València, 46980 Paterna, València, Spain.
authors: María
authors: M
authors: Castellano
authors: Francisco R
authors: FR
authors: Fortea-Pérez
authors: Salah-Eddine
authors: SE
authors: Stiriba
authors: Miguel
authors: M
authors: Julve
authors: Francesc
authors: F
authors: Lloret
authors: Donatella
authors: D
authors: Armentano
authors: Giovanni
authors: G
authors: De Munno
authors: Rafael
authors: R
authors: Ruiz-García
authors: Joan
authors: J
authors: Cano