Spin control in ladderlike hexanuclear copper(II) complexes with metallacyclophane cores.
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.
Pardo
Emilio
E
Departament de Química Inorgànica, Instituto de Ciencia Molecular, Universitat de València, 46100 Burjassot, València, Spain.
Bernot
Kevin
K
Julve
Miguel
M
Lloret
Francesc
F
Cano
Joan
J
Ruiz-García
Rafael
R
Delgado
Fernando S
FS
Ruiz-Pérez
Catalina
C
Ottenwaelder
Xavier
X
Journaux
Yves
Y