高等学校化学学报 ›› 1992, Vol. 13 ›› Issue (12): 1572.

• 论文 • 上一篇    下一篇

二(烷基黄原酸)合铂(Ⅱ)与哌啶在苯介质中连串取代反应的动力学及机理

王淑勤, 刘宝生, 申世刚, 丁天惠, 王安周   

  1. 河北大学化学系, 保定, 071002
  • 收稿日期:1991-12-14 修回日期:1992-09-17 出版日期:1992-12-24 发布日期:1992-12-24
  • 通讯作者: 王安周
  • 基金资助:

    国家自然科学基金

Kinetics and Mechanism of the Consecutive Substitution Reactions of Bis (alkylxanthato)platinium(Ⅱ) with Piperidine in Benzene Medium

WANG Shu-Qin, LIU Bao-Sheng, SHEN Shi-Gang, DING Tian-Hui, WANG An-Zhou   

  1. Department of Chemistry, Hebei University, Baoding, 071002
  • Received:1991-12-14 Revised:1992-09-17 Online:1992-12-24 Published:1992-12-24

摘要: 研究了二(境基黄原致)合铂(Ⅱ)[Pt(S2COR)2(R=Me,Et,n-Pr,n-Bu,Am)]与哌啶连串取代反应动力学,提出了包括前期平衡的反应机理,据此导出的速率方程圈满地解释了全部实验事实.计算了前期平衡常数和速控步骤的速率常数,并对加成物的结构作了合理推断,计算了各活化参数和两个反应系的等动力学温度β1=283±7K和β2=263±25K.

关键词: 二(烷基黄原酸)合铂(Ⅱ), 哌啶, 连串取代反应, 动力学及机理

Abstract: The title reactions have been studied by spectrophotometry.The products of the first and second steps of the substitution reactions are Pt(S2COR)(S2CN(CH2)5)and Pt(S2CN(CH2)5)2 respectively.The reaction order in each of the complexes is unity,and the apparent reaction orders in piperi-dine are in the ranges of 2.0 to 2.6 and 1.5 to 1.9 respectively.Amechanism involving an additive preequilibration was proposed.The rate equation derived from the mechanism explained all of the experimental results satisfactorily.The preequilibrium constants and the rate constants of the rate determining steps were calculated,and the structures of the adducts were discussed and reasonably infered,Activation parameters and isokinetic temperatures(β1=283±7K,β2=263±25K)were calculated.

Key words: Bis(alkylxanthato)platinium(II), Piperidine, Consecutive substitution reaction, Kinetics and mechanism

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