CRYSTALLINE COMPLEXES OF ERBIUM BROMIDE AND LUTETIUM BROMIDE WITH ACETAMIDE

Abstract

New acetamide complexes of erbium and lutetium bromides LnBr₃4AA4H₂O, (Ln = Er, Lu; AA  acetamide) were synthesized. The resulting complexes were characterized by chemical analysis, infrared spectroscopy and X-ray diffraction method. It is shown that the coordination of the ligands (water molecules and acetamide) by the lanthanide atoms occurs through the oxygen atoms, and the coordination polyhedron is a distorted square antiprism (CN = 8). The bromide ions are not coordinated and are located in the outer sphere. The degree of ionic character of the lanthanide–acetamide bonds was estimated. The structural characteristics of the complexes [LnL₄(H₂O)₄] Br₃ (Ln = Er, Lu; L = AA) were compared.

Keywords

• complex compounds, structure, acetamide, erbium, lutetium, bromide, the coordination polyhedron