SYNTHESIS AND PROPERTIES OF COMPLEXES OF SOME LIGHT RARE EARTH ELEMENTS BASED ON BENZOATE AND 1,10-PHENANTROLINE MIXED LIGANS

Abstract

Some mixed ligands complexes of rare earth elements with benzoate and 1,10-phenantroline with
the general formula [Ln(Bez)3(Phen)].2H2O (Ln: La, Nd, Sm; Bez-: benzoate; Phen: 1,10-
phenantroline) have been prepared. The characterization of these complexes have been
investigated by IR, thermal analysis and mass-spectroscopy methods. The coordination modes of the
ligands to Ln(III) centres have been investigated by IR spectra. Mass-spectroscopy showed that the
complexes are monomes. TG- curves indicate that the complexes are unstable temperature. The
thermal separation of the complexes was supposed as follows: