L1
/
L2
and Ce
3+
/ Pr
3+
/ Nd
3+
ions resulted in the formation of
complexes
1
-
6
adopting 2:1 stoichiometry between ligand and the metal ion which has been
ascertained by elemental analyses, FTIR and mass spectral studies. Central metal ions are eight-
coordinated which is completed by two units of the charge-neutral ligand coordinating in
tetradentate fashion. Therefore, complexes
1
-
6
are ionic in nature in which the positive charges
on complexes are compensated by nitrate anions.
[49]
Mass spectral studies
ESI-MS spectra both for ligands
L1
,
L2
and their complexes
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