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化学学报
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化学学报 ›› 1994, Vol. 52 ›› Issue (10): 980-984. 上一篇    下一篇

研究论文

苯乙酮缩氨脲类化合物及其正负离子基的氮氢键的断裂能

赵永昱;还振威;程津培   

  1. 南开大学化学系
  • 发布日期:1994-10-15

Cleavage energies of nitrogen-hydrogen bonds in para-substituted acetophenone semicarbazones and corresponding radical ions

ZHAO YONGYU;HAI ZHENWEI;CHENG JINPEI   

  • Published:1994-10-15

PDF

491

被引次数

7

本文利用热力学循环原理,由苯乙酮缩氨脲类化合物的酸性解离常数[pK~a(HA)]和相应的氧化还原电位[E~o~x(HA),E~r~d(HA)和E~o~x(A^-)] 求得了表征自由基热力学稳定性的均裂键能(BDE)及反映正负离子基断裂方式与能量的pK~a(HA^+),BDE(HA^-),ΔG~(H^-)(A),对所得结果的取代基效应进行了讨论

关键词: 取代基效应, 缩氨基脲 P, 氧化还原电位, 自由基, 离解常数, 均裂键能, 热力学稳定性, 离子基

BDE,pKa(HA+), BDE(HA-) and DGH-(A.) for para-substituted acetophenone semicarbazones 4-RC6H4C(:NNHCONH2)Me were estimated from thermodn. cycles by combining their equilibrium acidities [pKa(HA)] with the appropriate electrode potential data [Eox(HA),Erd(HA) and Eox(A-)]. The results were discussed in terms of the substituent effects.

Key words: SUBSTITUENT EFFECT, SEMICARBAZONE P, OXIDATION-REDUCTION POTENTIAL, FREE RADICALS, DISSOCIATION CONSTANT, THERMODYNAMIC STABILITY, ION-RADICAL (=RADICAL ION)

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