NGHIÊN CỨU SỰ TẠO PHỨC ĐƠN, ĐA PHỐI TỬ CỦA MỘT SỐ NGUYÊN TỐ ĐẤT HIẾM (Ho, Er, Tm, Yb, Lu) VỚI L-METHIONIN VÀ AXETYL AXETON TRONG DUNG DỊCH BẰNG PHƯƠNG PHÁP CHUẨN ĐỘ ĐO pH

Abstract

The stability constant of the mixed ligand complexes and simple ligand complexes formed between Ho³⁺, Er³⁺, Tm³⁺, Yb³⁺, Lu³⁺ with L-Methionine and Acetylacetonane (HAcAc) were determined by potentiometric, titration in aqueous solution (30±1^oC; I = 0.1). The complexes following 1:2 proportion have form of LnMet²⁺, LnAcAc²⁺, Ln(AcAc)₂⁺; following 1:2:2 proportion; 1:4:2 proportion have form of LnAcAcMet⁺, Ln (AcAc)₂Met. The mixed ligand complexes turned out to be much stronger than the simple ligand complexes.

Keywords: Some race earth elements, simple and mixed ligand, L-methionine and Acetylacetonane, potentionmetric titration, the simple and mixed ligand complexes.