Abstract: In this paper, thirteen novel rare earth complexes of 3-ferroeenyiacryiate with a general formula REL₃·H₂O(RE=La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm and Yb; L = C₅H₅FeC₅H₄CH = COO^-) were synthesized by the reaction of trivalent rare earth chloride with sodium 3-ferrocenylacrylate in anhydrous alcohol.The cpmplexes were characterized by means of elementary analysis, molar conductance, SRand TG-DTA.The much lower conductance values support the view that they are much less ionized.In IRspectra, the C=Cand C-Hbands of the ferrocenyl(Fc) are not greatly changed after the coordination, which shows that RE³⁺ ion with Fc has not directly action.The various bands associated with the carboxylate group motion are considerably altered.In the complexes, vas(COO^-) shifts to lower frequencies(32-35 cm^-1), v,(COO^-) shifts to higher frequencies (3-7 cm^-1).The absorption band in the region₄₉₅-498 cm^-1 is attributed to O - Mmotion.These results indicate that the carboxylate group coordinate to the rare earths as a symmetrical biden-tate iigand.In addition, the certain relationship between vas(COO^-) and the atomic numbers of rare earths is presented.TG-DTAindicated that the complexes lose water at about 90℃ and begin to decompose endothemically at about 216℃.The results of X-ray powder diffraction show that all complexes are crystalline materials.

Key words: 3-Ferrocenylacrylic acid, Rare earth complexes, Synthesis, Characterization