STUDIES ON ORGANOLANTHANIDE COMPLEXES .49. SYNTHESIS OF MIXED TRIS-CYCLOPENTADIENYL LANTHANIDE COMPLEXES, (CH3OCH2CH2C5H4)LN(C5H5)2, CONTAINING ONE INTRAMOLECULAR COORDINATION BOND, CRYSTAL-STRUCTURE OF (CH3OCH2CH2C5H4)Y(C5H5)2

By the one-pot reaction of lanthanide trichloride with 2 equivalents o f sodium cyclopentadienyl and 1 equivalent of sodium 2-methoxyethylcyc lopentadienyl in THF, the mixed tricyclopentadienyl lanthanide complex es (C5H5)2Ln(CH3OCH2CH2C5H4) (Ln = La, Sm, Gd, Er, Yb, Y) were obtaine d. The compound (CH3OCH2CH2C5H4) Y(C5H5)2 (6) crystallized from THF. T he central metal Y is coordinated to three cyclopentadienyl ring centr oids and the ether oxygen forming a distorted tetrahedron. The average Y-C(eta5) bond distance and Y-O bond distance of 6 are 2.702 and 2.41 4 angstrom, respectively.