The complexes of rare earth with diethylammonium diethyldithiocarbamate Et~2NH~2[RE9S~2CNEt~2)~4] (RE=La to Lu, Y; except Pm) have been synthesized in dry N~2 atmosphere and characterized by elemental analyses, IR and UV spectra, molar conductance, differential therrmal analyses (DTA) and thermogravimetric (TG). The structure of the lanthanum complex was determined by X-ray single crystal diffraction analysis. The results show that La^3^+ is coordinated by eight S atoms belonging to four ligands. The coordination polyhedron can be described as a distorted dodecahedron.

Key words: RARE EARTH METAL COMPLEX, ETHYLAMINO-, COMPLEX COMPOUNDS, LIGANDS, SULPHUR-CONTAINING, RARE EARTH, SYNTHESIS, CHARACTERIZATION, ULTRAVIOLET SPECTROPHOTOMETRY, INFRA-RED