Chiroptical Studies of Lanthanide (III) Complexes of Sulphur–Nitrogen–Oxygen Ligands Derived from l‐Cysteine and Acetylbenzene

Abstract

l‐cysteine and acetylbenzene react with La3 +, Pr3 +, Nd3 +, Sm3 +, Eu3 +, Gd3 +, Tb3 + and Ho3 + to yield new chiral complexes. They were characterized by chemical analyses, molar conductance, magnetic properties, CD, XPS, 1H NMR, visible and IR spectra. It was found that the complexes behave as non‐electrolytes in methanol solution, and possess the stoichiometric ratio of Ln:C:N:O:Cl = 0.5:11.0:1.0:3.0:1.0 which is consistent with the analytical data. TGA data indicate that the complexes sustain weight loss in the 70–100°C region and possess crystallized water. Their dominant conformers were determined from CD spectra supported by 1H NMR data.