Synthesis of Rhodanine Color Reagents and the Color Reaction with Cu(Ⅱ)

Chinese Journal of Applied Chemistry ›› 1994, Vol. 0 ›› Issue (5): 91-94.

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Synthesis of Rhodanine Color Reagents and the Color Reaction with Cu(Ⅱ)

Wang Lun, Shi Haoxin, Sun Chunlin, Wang Zhongyi

Department of Chemistry, Anhui Normal University, Wuhu 241000

Received:1993-11-30 Revised:1994-04-17 Published:1994-10-10 Online:1994-10-10

Abstract

Abstract: Three rhodanine color reagents 5-(4'-chloro-2'-carboxylphenylazo)-rhodanine,5-(4'-bromo-2'-carboxylphenylazo )-rhodanine and 5-(4'-iodo-2'-carboxylphenylazo)-rho-danine have been synthesized. The dissociation constants of the color reagents K_a₁ and K_a₂ are given. The color reactions of them with Cu(Ⅱ) are studied.The molar ratio of Cu(Ⅱ) to the color reagents are found to be 1:2. The Beer's law is obeyed in the range of 0～2.5μg/mL for Cu(Ⅱ). The chloro reagent has been used for copper determination in alloy samples with satisfactory results.

Key words: rhodanine, spectrophotometry, copper

Wang Lun, Shi Haoxin, Sun Chunlin, Wang Zhongyi. Synthesis of Rhodanine Color Reagents and the Color Reaction with Cu(Ⅱ)[J]. Chinese Journal of Applied Chemistry, 1994, 0(5): 91-94.

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Synthesis of Rhodanine Color Reagents and the Color Reaction with Cu(Ⅱ)

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