title: Spin control in ladderlike hexanuclear copper(II) complexes with metallacyclophane cores.
abstract: Two new hexanuclear oxamatocopper(II) complexes 3 and 4 have been synthesized from the binuclear copper(II) complexes of the meta- and para-phenylenebis(oxamate) ligands, respectively. Complexes 3 and 4 possess an overall ladderlike structure made up of two oxamate-bridged linear trinuclear units ("rails") connected through two phenylenediamidate bridges ("rungs") between the central copper atoms to give metallacyclic cores of the meta- and para-cyclophane type, respectively. They show different ground spin states, S = 1 (3) or S = 0 (4), depending on the substitution pattern in the aromatic spacers. The triplet state molecule 3 containing two spin doublet Cu(II)3 units connected by two m-phenylenediamidate bridges represents a successful extension of the concept of "ferromagnetic coupling units" to metal complexes, which is a well-known approach toward high spin organic radicals.
authors.affiliation: Departament de Química Inorgànica, Instituto de Ciencia Molecular, Universitat de València, 46100 Burjassot, València, Spain.
authors.forename: Emilio
authors.initials: E
authors.lastname: Pardo
authors.forename: Kevin
authors.initials: K
authors.lastname: Bernot
authors.forename: Miguel
authors.initials: M
authors.lastname: Julve
authors.forename: Francesc
authors.initials: F
authors.lastname: Lloret
authors.forename: Joan
authors.initials: J
authors.lastname: Cano
authors.forename: Rafael
authors.initials: R
authors.lastname: Ruiz-García
authors.forename: Fernando S
authors.initials: FS
authors.lastname: Delgado
authors.forename: Catalina
authors.initials: C
authors.lastname: Ruiz-Pérez
authors.forename: Xavier
authors.initials: X
authors.lastname: Ottenwaelder
authors.forename: Yves
authors.initials: Y
authors.lastname: Journaux