COMPLEXES BETWEEN LANTHANIDE PICRATES AND N,N-DIMETHYLACETAMIDE (DMA)- SYNTHESIS, CHARACTERIZATION AND STRUCTURE OF THE SAMARIUM COMPOUND

Complexes with the composition Ln(pic)(3).3DMA (Ln = La-Lu, Y; pie, pi crate; DMA, N,N-dimethylacetamide) were synthesized and characterized. They behave as non-electrolytes in nitromethane and acetonitrile. Acc ording to X-ray powder patterns, three different types of diffractogra ms were obtained: (a) La-Pr; (b) Nd-Yb, Y; (c) Lu. Single-crystal X-ra y analysis of the samarium compound indicates that Sm3+ is coordinated by six oxygen donors from three bidentate picrates through the phenox y and ortho nitro groups and by three oxygens from the DMA molecules f orming a somewhat distorted tricapped trigonal prism. The absorption s pectra of the neodymium compound in the solid state and in solution we re investigated.