SYNTHESIS AND CHARACTERIZATION OF LANTHANIDE COMPLEXES OF 1,4,7,10,13-PENTAAZACYCLOPENTADECANE

Twelve new complexes of lanthanide nitrates with 1,4,7,10,13-pentaazac yclopentadecane (L) have been prepared under nitrogen using anhydrous acetonitrile as reaction medium. The complexes having the composition M(L)(NO3)(3) (M = La, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Er, Tm, Yb and Y) we re characterized by elemental analysis, IR spectra and conductivity me asurements. An X-ray crystallographic structural determination of the lanthanum complex shows that the five nitrogen atoms from the ligand c oordinate to the metal ion on one side and the three bidentate nitrate groups coordinate on the opposite side. The coordination number of th e metal ion is eleven. (C) 1997 Elsevier Science Ltd.