Synthesis, crystal structures, magnetic and luminescent properties of unique 1D p-ferrocenylbenzoate-bridged lanthanide complexes

Treatments of p-ferrocenylbenzoate [p-NaOOCH(4)C(6)Fc, Fc = (eta(5)-C5H5)Fe(eta(5)-C5H4)] with Ln(NO3)(3)center dot nH(2)O afford seven p-ferrocenylbenzoate lanthanide complexes {[Ln(OOCH(4)C(6)Fc)(2)(mu(2)-OOCH(4)C(6)Fc)(2)(H2O)(2)] (H3O)}(n) [Ln = Ce (1), Pr (2), Sm (3), Eu (4), Gd (5), Tb (6) and Dy (7)]. X-ray crystallographic analysis reveals that the isomorphous complexes {[Ce(OOCH(4)C(6)Fc)(2)(mu(2)-OOCH(4)C(6)Fc)(2)(H2O)(2)](H3O)}(n) (1) and {[Pr(OOCH(4)C(6)Fc)(2)(mu(2)-OOCH(4)C(6)Fc)(2)(H2O)(2)](H3O)}(n) (2) form a unique 1D double-bridged infinite chain structure bridged by mu(2)-OOCH(4)C(6)Fc groups. Each Ln(III) ion adopts a dodecahedron coordination environment with eight coordinated oxygen atoms from two terminal monodentate coordinated FcC(6)H(4)COO(-) units, two terminal monodentate coordinated H2O molecules and four mu(2)-(-)OOCH(4)C(6)Fc units. The luminescent spectra reveal that only 4 and 6 exhibit characteristic emissions of lanthanide ions, Eu(III) and Tb(III) ions, respectively. The variable-temperature magnetic Properties of 5 and 7 suggest that a ferromagnetic Coupling between spin carriers may exist in 5. (C) 2009 Published by Elsevier Inc.