The reaction of CH~3N(CH~2CH~2C~5H~4)~2Na~2 with LnCl~3 (Ln=La, Pr, Nd and Sm) in tetrahydrofuran afforded a new type of binuclear cyclopentadienyl lanthanide complexes, [CH~3N(CH~2CH~2C~5H~4)~2Ln]~2 (C~5H~4CH~2CH~2)~2NCH~3, which were fully characterized by elemental analyses, MS, IR and ^1H NMR. Their spectroscopies suggest that nitrogen atom of the terminal ringlinked biscyclopentadienyl ligand be intramolecularly coordinated with the metal in a chelating fashion, while that of the interlinking one be intra-or intermolecularly coordinated with the metal.

Key words: DINUCLEAR COMPLEX, RARE EARTH METAL COMPLEX