Trinuclear lanthanide complexes of a compartmental ligand N,N′-bis(2-pyridinyl)-2,6-pyridinedicarboxamide: A spectroscopic investigation

Trinuclear lanthanide complexes of the formula [Ln3(PPDA)(NO3)6(H2O)2]·NO3·2H2O where Ln = La(III), Pr(III), Sm(III), Nd(III), Eu(III) Gd(III) Tb(III), Dy(III) and Y(III); H2PPDA = N,N′-bis(2-pyridinyl)-2,6-pyridinedicarboxamide, have been isolated. The complexes were characterized by elemental analyses, conductivity measurements, magnetic susceptibility measurements and spectral (IR, NMR, UV–vis, fluorescence, FAB and EPR) and thermal studies.