H. Ishii, T. Odashima, Yoshiaki Kawamonzen
Dec 1, 1990
Citations
0
Influential Citations
5
Citations
Journal
Bulletin of the Chemical Society of Japan
Abstract
The complexation reaction of four water-soluble hydrazones, α-(5-nitro-2-pyridyl)hydrazono-α-(2-quinolyl)-3-toluenesulfonic acid (NPHQTS), α-(5-nitro-2-pyridyl)hydrazono-α-(2-thiazolyl)-3-toluenesulfonic acid (NPHTTS), α-(2-benzothiazolyl)-α-(5-nitro-2-pyridyl)hydrazono-3-toluenesulfonic acid (BTNPHTS) and α-(2-benzimidazolyl)-α-(5-nitro-2-pyridyl)hydrazono-3-toluenesulfonic acid (BINPHTS), with nickel(II) has been studied spectrophotometrically. These hydrazones react with nickel(II) to form a stable 1:2 (metal: ligand) complexes with high molar absorptivities. A sensitive and selective spectrophotometric method for the determination of nickel with BINPHTS has been developed. The nickel–BINPHTS complex is formed quantitatively in the pH range 6.5–8.9 and its absorption spectrum shows a maximum at 498 nm. Beer’s law is obeyed over the range 0.02–0.8 μg cm−3 of nickel and the apparent molar absorptivity of the complex is 8.67×104 dm3mol−1cm−1 at 498 nm. The proposed method was applied to the determination ...