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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 14, Number 5
BKCSDE 14(5)
May 20, 1993 

Effects of N-and C-Substituents on Protonation of 14-Membered Tetraaza Macrocycles and Formation of their Copper(Ⅱ) and Nickel(Ⅱ) Complexes
Shin-Geol Kang*, Mi-Seon Kim, Jang-Sik Choi, Moon-Hwan Cho
The protonation constants of the 14-membered tetraaza macrocycles A(3,14-dimethyl-2,6,13,17-tetraazatricyclo[l6.4.01 ,18.07,12]docosane) and B(2,3,6,13,14,17-hexamethyl-2,6,13,17-tetraazatric yclo-[l6.4.01,18.07,12]docosane) were measured by potentiometry. The formation constants of each of these ligands with copper(Ⅱ) and nickel(Ⅱ) were determined by an out-of-cell spectrophotometric method. The results indicate that the per-N-methylated macrocycle B exhibits much higher selectivity for complex formation with copper(Ⅱ) over nickel(Ⅱ) ion than A and other related 14-membered tetraaza macrocycles. The effects of the N-and C-substituents on the basicity and the metal ion selectivity of the ligands are discussed. The synthesis and properties of copper(Ⅱ) and nickel(Ⅱ) complexes of B are also described.
594 - 598
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