Synthesis and Characterization of Open-Ring Polycomponent Complexes Formed in the Reaction of Lanthanides with m-Phenylenediamine and Dibenzoyl Methane

Abstract

Six new polycomponent complexes of lanthanides have been prepared by template reaction of m-phenylenediamine with dibenzoyl methane in the presence of lanthanide chlorides and conc. HCl in methanol solution. They have been characterized by elemental analysis, molar conductivity data, IR, UV, ¹H NMR and TG-DTA. The measured results show that m-phenylenediamine is mono-condensed with dibenzoyl methane, forming a mono-condensate m-phenylenediaminediphenylpropane-1,3-dioneimine (L). The L is coordinated with lanthanide by carbonyl oxygen and azomethine nitrogen to form the complexes. The formula of the complexes is LnL₂Cl₃.2H₂O, where Ln is Nd, Sm, Eu, Gd, Dy and Er, respectively.