Influence of anionic ligands (X) on the nature and magnetic properties of dinuclear LCuGdX3 center dot nH(2)O complexes (LH2 standing for tetradentate Schiff base ligands deriving from 2-hydroxy-3-methoxybenzaldehyde and X being Cl, N3C2, and CF3COO)
Jp. Costes et al., Influence of anionic ligands (X) on the nature and magnetic properties of dinuclear LCuGdX3 center dot nH(2)O complexes (LH2 standing for tetradentate Schiff base ligands deriving from 2-hydroxy-3-methoxybenzaldehyde and X being Cl, N3C2, and CF3COO), INORG CHEM, 39(2), 2000, pp. 165-168
The monometallic precursor (LCu)-Cu-1 ((LH2)-H-1 standing for 1,3-bis((3-me
thoxysalicylidene)amino)-2,2'-dimethylpropane) reacts with GdCl3.6H(2)O to
afford a dinuclear complex which crystallizes in the orthorhombic space gro
up Pca2(1) (No. 29) in a cell having the dimensions a = 9.0246(11) Angstrom
, b = 16.5198(14) Angstrom, c = 20.286(2) Angstrom, and Z = 4. Analysis of
the structural data shows that it may be formulated as [(LCuCl2Gd)-Cu-1(H2O
)(4)]Cl.2H(2)O. The cationic dinuclear unit possesses a CuO2Gd bridging cor
e which is almost planar. The complex displays a ferromagnetic interaction
(10.1 cm(-1)) which is the largest yet reported for a structurally characte
rized dinuclear (Cu-Gd) complex. Lower magnetic interactions are observed f
or neutral (LCuGdX3)-Cu-1.H2O complexes (X = N3C2, CF3COO). Consideration o
f the magnetic and structural data obtained for various dinuclear (Cu-Gd) c
omplexes leads to a correlation between the magnitude of the magnetic inter
action and the exponential of the dihedral angle between the two halves of
the CuO2Gd bridging core.