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2001•Journal of Analytical ScienceRequires access

Spectrophotometric Study on Color Reaction of meso-Tetra(3-chloro-4-sulfophenyl) Porphyrin with Cobalt(II)

Jun Li, Zhao Zhang

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Abstract

Under weakly alkaline conditions, the color reaction of a new reagent, meso tetra(3 chloro 4 sulfophenyl) porphyrin ( m ClTPPS 4) with cobalt has been investigated. Without other auxiliary reagents, the porphyrin reagent reacts with Co(Ⅱ) to form 1∶1(M∶L) complex in boiling water. The maximum absorption wavelength of the complex is 426nm. The molar absorptivity is 4.0×10 5L·mol -1 ·cm -1 . The proposed method has been applied to the determination of cobalt in vitamin B 12 with satisfactory results.

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What this paper is about

Under weakly alkaline conditions, the color reaction of a new reagent, meso tetra(3 chloro 4 sulfophenyl) porphyrin ( m ClTPPS 4) with cobalt has been investigated. Without other auxiliary reagents, the porphyrin reagent reacts with Co(Ⅱ) to form 1∶1(M∶L) complex in boiling water. The maximum absorption wavelength of the complex is 426nm. The molar absorptivity is 4.0×10 5L·mol -1 ·cm -1 . The proposed method has been applied to the determination of cobalt in vitamin B 12 with satisfactory results.

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Available abstract

Under weakly alkaline conditions, the color reaction of a new reagent, meso tetra(3 chloro 4 sulfophenyl) porphyrin ( m ClTPPS 4) with cobalt has been investigated. Without other auxiliary reagents, the porphyrin reagent reacts with Co(Ⅱ) to form 1∶1(M∶L) complex in boiling water. The maximum absorption wavelength of the complex is 426nm. The molar absorptivity is 4.0×10 5L·mol -1 ·cm -1 . The proposed method has been applied to the determination of cobalt in vitamin B 12 with satisfactory results.

Key concepts: Porphyrin, Reagent, Chemistry, Cobalt, Molar absorptivity, Color reaction, Tetra, Absorption (acoustics)

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