거대고리 아자크라운화합물과 전이금속 및 란탄족금속이온의 착물의 안정도
The Stability Constant of Transition and Lanthanide Metal Ions Complexes with 15 Membered Macrocyclic Azacrown Ligands
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Abstract
The azacrown compounds, 1,4-dioxa-7,10,13-triazacyclopentadecane-N,N',N''-triacetic acid, N-ac3[15]aneN3O2(II a) and 1,4-dioxa-7,10,13-triazacyclopentadecane-N,N',N''-tripropioc acid, N-pr3[15]aneN3O2(IIb) weresynthesized by modified methods. Potentiometry was used to determine the protonation constant of the N-ac3[15]aneN3O2 and N-pr3[15]aneN3O2. The stability constants of complexes of the trivalent metal ions of Ce3+, Eu3+, Gd3+, andYb3+ and divalent metal ions of Co2+, Ni2+, Cu2+, and Zn2+ with the ligands N-ac3[15]aneN3O2 and N-pr3[15]aneN3O2 havebeen determined at 250.1oC in 0.1 M NaClO4 solution by potentiometric methods. The metal ion affinities of the twotriazamacrocyclic ligands with three pendant acetate or propionate groups are compared to those obtained for the similarligands, 1,7-dioxa-4,10,13-triazacyclopentadecane-N,N',N''-triacetic acid, and 1,7-dioxa-4,10,13- triazacyclopentadecane-N,N',N''-tripropioc acid. The trends in stability of complexes for diferent metal ions due to changes in the nitrogen posi-tion of the donor atoms of the ligand are discussed.