STUDIES ON LANTHANIDE COMPLEXES WITH OPEN-CHAIN MULTIDENTATE LIGANDS .9. SYNTHESIS, CHARACTERIZATION AND STRUCTURE OF THE COMPLEXES OF LANTHANIDE NITRATES WITH N,N'-BIS(4-METHOXYPHENYL)TETRAGLYCOLLIC DIAMIDE

Lanthanide nitrate complexes with N,N'-bis(4-methoxyphenyl)tetraglycol lic diamide (L) have been prepared in non-aqueous medium. These new co mplexes with the general formula [Ln(L)(NO3)3] (Ln = La, Ce, Pr, Nd an d Sm) have been characterized by elemental analysis, conductivity meas urements and IR spectra. An X-ray crystallographic structural determin ation of the praseodymium complex shows that the pentadentate organic ligand wraps around the lanthanide ion which is also bonded to three b identate nitrate groups, achieving the uncommon undeca-coordination.