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Abstract
Yttrium and lanthanide iodide complexes with the Schiff base 4-N-(4′-antipyrylmethylidene)aminoantipyrine (AA) of the composition [Ln(AA)2I]I2 (where Ln = Y, La, Pr, Nd, Sm, Eu, Gd, Dy, Ho and Er) have been synthesized and characterized by elemental analyses, electrical conductance in non-aqueous solvents, magnetic susceptibility measurements, IR, electronic (in the solid and liquid states) as well as proton NMR (M = La and Y) spectra and thermogravimetric analyses. The Schiff base AA acts as a neutral tridentate ligand in all these complexes, coordinating through the oxygens of both carbonyl groups and the azomethine nitrogen. Only one of the iodide ions is coordinated to the metal ion. A coordination number of seven may be assigned to the metal ion in these complexes.