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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

Nguyễn Trọng Uyển, Lê Hữu Thiềng, Nguyễn Thuý Vân

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±1oC; 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.


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