title: Tuning the spin ground state in heterononanuclear nickel(II)-copper(II) cylinders with a triangular metallacyclophane core.
abstract: Two new heterometallic Ni(II)(n)Cu(II)((9-n)) complexes [n = 1 (2) and 2 (3)] have been synthesized following a multicomponent self-assembly process from a n:(3 - n):2:6 stoichiometric mixture of Ni(2+), Cu(2+), L(6-), and [CuL'](2+), where L and L' are the bridging and blocking ligands 1,3,5-benzenetris(oxamate) and N,N,N',N'',N''-pentamethyldiethylenetriamine, respectively. Complexes 2 and 3 possess a unique cyclindrical architecture formed by three oxamato-bridged trinuclear linear units connected through two 1,3,5-substituted benzenetris(amidate) bridges, giving a triangular metallacyclophane core. They behave as a ferromagnetically coupled trimer of two (2)/one (3) S = (1)/(2) Cu(II)(3) plus one (2)/two (3) S = 0 Ni(II)Cu(II)(2) linear units with overall S = 1 Ni(II)Cu(II)(8) (2) and S = (1)/(2) Ni(II)(2)Cu(II)(7) (3) ground states.
authors.affiliation: Institut Parisien de Chimie Moléculaire, UPMC, Université Paris 06, F-75252 Paris, France.
authors.forename: Marie-Claire
authors.initials: MC
authors.lastname: Dul
authors.forename: Jesús
authors.initials: J
authors.lastname: Ferrando-Soria
authors.forename: Emilio
authors.initials: E
authors.lastname: Pardo
authors.forename: Rodrigue
authors.initials: R
authors.lastname: Lescouëzec
authors.forename: Yves
authors.initials: Y
authors.lastname: Journaux
authors.forename: Rafael
authors.initials: R
authors.lastname: Ruiz-García
authors.forename: Joan
authors.initials: J
authors.lastname: Cano
authors.forename: Miguel
authors.initials: M
authors.lastname: Julve
authors.forename: Francesc
authors.initials: F
authors.lastname: Lloret
authors.forename: Oscar
authors.initials: O
authors.lastname: Fabelo
authors.forename: Jorge
authors.initials: J
authors.lastname: Pasán
authors.forename: Catalina
authors.initials: C
authors.lastname: Ruiz-Pérez