Determination of Thiosemicarbazones by Means of the Induced Iodine-Azide Reaction |
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Authors: | Jan Kurzawa Krystyna Janowicz |
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Institution: | (1) Institute of Chemistry, Poznań University of Technology, 60-965 Poznań, Poland, PL |
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Abstract: | The iodine-azide reaction induced by eight thiosemicarbazones was investigated. Inducing properties of thiosemicarbazones
are different and depend on the parent carbonyl compound used for synthesis. The inductor coefficients of the examined thiosemicarbazones
vary from 61 to 176. Optimum conditions for the determination of microamounts of thiosemicarbazones are given. The detection
limit for the determination by the back-titration method depends on the inducing activity and is 0.9 μg for phenyl-thiosemicarbazones
and 2 μg for diethyl-thiosemicarbazone in a 5-mL sample, and this corresponds to a concentration of 0.9 × 10−6 mol/L and , respectively. The automatic titration with the diluted iodine solution decreases the detection limit to about 50 ng in a
10-mL sample.
Received October 28, 1998. Revision April 9, 1999. |
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Keywords: | : Thiosemicarbazones iodine-azide reaction |
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