Complexes of Sm(III) and Dy(III) with piperazines

Complexes of SmCl3, DyCl3, Sm(NO3)3 and Dy(NO3) with piperazine, N-methylpiperazine, 2-methylpiperazine, N-phenyl-piperazine and N, N'-dimethyl-piperazine have been prepared and characterized on the basis of elemental analyses, IR and electronic reflectance spectra and magnetic susceptibility measurements. IR data indicate that the ligands are coordinated in the chair conformation giving polymeric bridged complexes and that the nitrate group is bidentate. Coordination numbers from 6 to 12 are proposed for the lanthanide ions. (author)