SYNTHESIS AND CHARACTERIZATION OF SOME NEW LANTHANIDE(III) CHELATES WITH 1,4-BIS-(2'-HYDROXYPHENYLAZOMETHINE) PHENYLENE

The chelates formed between 1,4-bis(2'-hydroxyphenylazomethine) phenyl ene with La, Ce, Pr, Nd, Sm, Gd, Dy, Er, Yb, and Lu ions have been inv estigated in solution using conductometric, potentiometric, and spectr ophotometric methods. The studies revealed the formation of M(2)L and ML complexes. The solid chelates have been characterized by elemental and thermal analysis, molar conductance, IR, H-1 NMR (for La and Lu ch elates), and electronic spectra. The bonding takes place through the c oordination of nitrogen in the -CH=N- group and the oxygen of the hydr oxyl group by proton displacement.