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Citation: 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, 44(5): 91-94. shu

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

1.
Department of Chemistry, Anhui Normal University, Wuhu 241000

Received Date: 30 November 1993
Available Online: 17 April 1994
Fund Project:

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 aregiven.The color reactions of them with Cu (Ⅱ) are studied.The molar ratio of Cu (Ⅱ) tothe 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 sam-ples with satisfactory results.
- rhodanine,
- spectrophotometry,
- copper
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