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.
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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 Ka1 and Ka2 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.
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Keywords:
- rhodanine,
- spectrophotometry,
- copper
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