Journal of the Korean Chemical Society (대한화학회지)

Korean Chemical Society (대한화학회)
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Kinetics Study of the Reaction of Bromine with Phenylhydrazine in Sulfuric Acid Media

페닐히드라진과 브롬의 반응메카니즘에 관한 연구

  • Park Byoung Bin (Department of Chemistry, Sung-Gyun-Gwan University) ;
  • Park Il H. (Department of Chemistry, Sung-Gyun-Gwan University) ;
  • Kong Young Kun (Department of Chemistry, Won Kwang University) ;
  • Choi Q. Won (Department of Chemistry, Won Kwang University)
  • Published : 1977.08.30
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Abstract

The reaction of phenylhydrazine with bromine in sulfuric acid solution has been studied kinetically. The pseudo-second-order rate constant is approximately inversely proportional to hydrogen-ion concentration when the concentration of sulfuric acid is lower than 1M. arom the study of the effect of potassium bromide concentration on the rate constant, it is concluded that both neutral bromine and tribromide ion participate in the reaction, the rate constants in 0.01M $H_2SO_4$ being $5{\times}10^5M^{-1},sec^{-1}\;and\;0. 7{\times}10^5M^{-1},sec^{-1}$, respectively at $20^{\circ}C$. The pseudo-second-order rate constant of 2.4-dinitrophenylhydrazine-bromine reaction is independent of hydrogen ion concentration. From the KBr addition experiment, the rate constants for $Br_2\;and\;Br_3^-$ were obtained as $1.2{\times}10^5M^{-1},sec^{-1}\;and\;2.0{\times}10^4M^{-1},sec^{-1}$, respectively.

황산산성에서 페닐히드라진과 브롬의 반응을 속도론적으로 검토하였다. 겉보기 2차 반응속도상수는 1M 이하의 황산농도에서는 수소이온 농도에 대략 역비례한다. KBr 첨가의 영향을 검토하여 $Br_2\;및\;Br_3^-$가 반응화학종이고, 이들의 속도상수는 $20^{\circ}C$의 0.01M $H_2SO_4$용액에서 각각 $5{\times}10^5M^{-1},sec^{-1}\;및\;0. 7{\times}10^5M^{-1},sec^{-1}$임을 밝혔다. 2,4-디니트로 페닐히드라진의 브롬과의 반응속도상수는 수소이온 농도에 거의 무관계하며 $Br_2\;및\;Br_3^-$에 대하여 각각 $1.2{\times}10^5M^{-1},sec^{-1}\;및\;2.0{\times}10^4M^{-1},sec^{-1}$이다.

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