Ln(SCN)3.OBB.nH2O and 2La(SCN)3.OBB.2H2O [Ln = Nd, Eu, Dy, Er, Yb; OBB = octanedioylbis(4'-benzo-15-crown-5); n = 1-5] were prepared Eu(SCN)2.OBB.THF.3H2O was also prepared under Ar being isolated from water and oxygen by reducing of the Eu(III) complex with the reagent Li/naphthalene in THF. The complexation of the rare earth ions with the bis(crown ether) and the differences between di- and trivalent europium complexes were established on the basis of elemental anal., TGA, DTA, ESR, IR, and Moessbauer spectra. The luminescence properties of the complexes were also studied.

Key words: SYNTHESIS, OCTANEDIOIC ACID P, RARE EARTH METAL COMPLEX, YTTERBIUM COMPLEX, TRIVALENCE, EUROPIUM COMPLEX, LANTHANUM COMPLEX, NEODYMIUM COMPLEX, BIVALENCE, PROPERTIES