ジメチルスルホキシド中における水素化リチウムによるニトロベンゼンの比色定量

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タイトル別名
  • Colorimetric determination of nitrobenzene with lithium hydride in dimethylsulfoxide
  • ジメチルスルホキシドチュウ ニ オケル スイソカ リチウム ニヨル ニトロベン

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抄録

Colorimetric determination of nitrobenzene with lithium hydride in dimethylsulfoxide was studied. Lithium hydride reacts with nitrobenzene in dimethylsulfoxide to form reddish violet solution in the presence of acetone (about 1%) and the colored compound has an absorption maximum at 540nm. The molar ratio of nitrobenzene and lithium hydride was found to be 1 : 2 by colorimetry. An absorbance of the solution did not change after 6h elapsed. The sensitivity limit of this determination was as low as 2×10-5M. The reaction was assumed to proceed as follows :<BR>2_??_-NO2+4(CH3SOCH2-·Li+)→<BR>[(CH3SOCH2-_??_-N=O-N=O-_??_-CH2SOCH3)2-<BR>·2Li+]+2LiOH+2DMSO<BR>The determination procedure is following; take 10ml of DMSO solution of nitrobenzene. Add 5ml of DMSO-lithium hydride (1×10-3M) and acetone to yield 1.0v/v% final concentration and dilute to 25ml with DMSO. Measure the absorbance at 540nm after 50min at 25°C. Calibration curve of nitrobenzene was linear from 2×10-5M to 8×10-5M. An absorbance was not affected by coexistence of a large amount of aniline because it did not react with lithium hydride, but water, inorganic acids and carboxylic acids interfered with the determination.

収録刊行物

  • 分析化学

    分析化学 28 (1), 1-4, 1979

    公益社団法人 日本分析化学会

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