Complexes of Yttrium and Lanthanide Bromides with 4-N-(2′-Hydroxybenzylidene) Aminoantipyrine

Abstract Ten new complexes of bromides of yttrium and lanthanides with 4-N-(2′-hydroxybenzylidene)amino-antipyrine (HBAAP) having the formula [Ln(HBAAP)2Br2]Br where Ln = Y. La, Pr, Nd, Sm, Eu, Gd, Dy, Ho and Er have been prepared and characterized. Molar conductance studies indicate 1:1 electrolytic behaviour for these complexes. Their infrared spectra show that HBAAP acts as a neutral tridentate ligand coordinating through the carbonyl oxygen, azomethine nitrogen and phenolic oxygen. Electronic spectra show the weak covalent character in the metal-ligand bond. Thermogravimetric studies indicate that these complexes are stable up to about 170 °C and undergo decomposition in two stages forming the respective metal bromides as the final products.