Potentiometric study of equilibrium constants of a novel triazine-thione derivative and its stability constants with Hg2+, Cu2+, Ni2+, Pb2+, and Zn2+ metal ions in ethanol and water mixed

被引：8
作者：
Polat, Fatih [1 ]
Atabey, Hasan [2 ]
Sari, Hayati [2 ]
Cukurovali, Alaaddin [3 ]
机构：
[1] Gaziosmanpasa Univ, Almus Polytech Coll, Tokat, Turkey
[2] Gaziosmanpasa Univ, Sci & Arts Fac, Dept Chem, Tokat, Turkey
[3] Firat Univ, Sci & Arts Fac, Dept Chem, Elazig, Turkey
来源：
TURKISH JOURNAL OF CHEMISTRY | 2013年 / 37卷 / 03期
关键词：
Potentiometry; triazine-thione; equilibrium constants; proton affinity; COMPLEXES; COPPER(II); CRYSTAL; ZN(II);
D O I：
10.3906/kim-1207-55
中图分类号：
O6 [化学];
学科分类号：
0703 ;
摘要：
The deprotonation constants of 5-hydroxy-5,6-di-pyridin-2-yl-4,5-dihydro-2H-[1,2,4] triazine-3-thione (HPT) and the stability constants of its Hg2+, Ni2+, Cu2+, Pb2+, and Zn2+ ion complexes were studied in 20% ethanol and water mixed at 25 +/- 0.1 degrees C and ionic strength (I) of 0.1 M supported by NaCl. Four pK(a) values of HPT were determined: 3.58, 6.30, 9.23, and 9.69. In various pH conditions, the different complex forms were formulated as ML, MHL, MH2L, MH3L, MH4L, and MH-2L between Hg2+, Ni2+, Cu2+, Pb2+, and Zn2+ ions and HPT. According to the potentiometric and spectrophotometric results, the HPT and Hg2+ combination formed a selective and highly stable complex at pH 7.
引用
收藏
页码：439 / 448
页数：10
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