Benzoic Acid Class Of Ferrocene Rare Earth Complexes Synthesis, Characterization And Performance Study

Two series of ferrocene benzonitrile acids lanthanide(III) complexes, namely, {[Ln(OOCH₄C₆Fc)₄(H₂O)₂](H3O)}n (Ln = La(1), Pr(2), Sm(3), Eu(4), Gd(5), Tb(6), Er(7), Lu(8))and {[Ln(OOCH₄C₆OCFc)4(H2O)2](H3O)}n (Ln = La(9), Pr(10), Sm(11), Eu(12), Gd(13), Tb(14), Er(15), Lu(16)), were obtained by treating o-ferrocenyl- benzoate(o-NaOOCH₄C₆Fc) and o-ferrocencarbonylbenzoate(o-NaOOCH₄C₆OCFc) (Fc=(η⁵-C5H5)Fe(η⁵-C5H5)) with LnCl3·6H2O. These complexes were characterized by infrared spectrum, ultra-violet spectrograph, element analysis and thermogravimetry analysis. On the basis of spectroscopical analysis and known analogous, their composition and structures are proposed. Each Ln(III) ion is coordinated by eight oxygen atoms from two terminal monodentate coordinated FcC6H4COO- units or FcCOC6H4COO- units, two terminal monodentate coordinated H2O molecules, and fourμ2-η²--OOCH₄C₆Fc units orμ2-η²--OOCH₄C₆OCFc units.Fluorescent spectra of complexes 1-8 and 9-16 using liquid sample suggest that, finally they all exhibita a broad emission, the emissions of 1-16 can be attributed to the ligand charge transfer. Molar conductivity of these complexes indicates that they are weak electrolyte...