物理化学学报 >> 1990, Vol. 6 >> Issue (06): 725-729.doi: 10.3866/PKU.WHXB19900617

研究简报 上一篇    下一篇

几种芳香萘环重氮盐热解性质的研究

宋华; 李大珍; 侯恩鑑; 邓希贤   

  1. 北京师范大学化学系
  • 收稿日期:1989-04-19 修回日期:1989-11-29 发布日期:1990-12-15
  • 通讯作者: 宋华

STUDIES ON THERMAL DECOMPOSITION OF SEVERAL AROMATIC NAPHTHALENEDIAZONIUM SALTS

Song Hua; Li Da-Zhen; Hou En-Jian; Deng Xi-Xian   

  1. Department of Chemistry; Beijing Normal University
  • Received:1989-04-19 Revised:1989-11-29 Published:1990-12-15
  • Contact: Song Hua

Abstract: Four aromatic naphthalenediazonium salts have been synthesised with the formula as: p-RC_(10)H_6N_2BF_4 (R=—H(Ⅰ), —NO_2(Ⅱ), —Br (Ⅲ), —N=N—C_6H_5(Ⅳ)). The thermal stability of the four diazonium salts is higher at room temperature and/or between certain temperature range, however they decomposed in the temperature range of 100-145 ℃. The thermal stability of the four diazonium salts correlated to their substituents is discussed. The possible mechanism of their thermal decomposition is presented. The order of the thermal stability of the four diazonium salts is: —NO_2(II)>—Br(III)>—N=N—C_6H_5(IV)>—H(I), and it is in consistent with the electron-withdrawing capability of the substituents. Some kinetic parameters of this reaction are determined also in this work. When diazonium salts (I), (II) and (III) react with NaBH_4, Then CIDNP signals have been detected with an improved NMR device. It shows that free radical processed play an important rote in thermal reductions of these diazonium salts with sodium borohydride.
From our experiment results the possibitity of diazonium salts (I)、(II) and (III) used as thermal sensitive materials may be promised.