高等学校化学学报

高等学校化学学报 ›› 1991, Vol. 12 ›› Issue (8): 1032.

• 论文 • 上一篇    下一篇

铕(Ⅲ)-α-萘乙酸极谱催化前波的研究

江子伟, 黄云辉, 高小霞   

  1. 北京大学化学系, 北京, 100871
  • 收稿日期:1990-11-14 出版日期:1991-08-24 发布日期:1991-08-24
  • 通讯作者: 高小霞
  • 基金资助:

    国家自然科学基金

Studies on Polarographic Catalytic Prewaves of Eu(Ⅲ) with α-Naphthaleneacetic Acid

Jiang Zi-wei, Huang Yun-hui, Gao Xiao-xia   

  1. Department of Chemistry, Peking University, Beijing, 100871
  • Received:1990-11-14 Online:1991-08-24 Published:1991-08-24

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摘要： 本文初步研究了合成的植物生长素α-萘乙酸在NH4Ac-K2SO4(pH=7)底液中与Eu(Ⅲ)共存时出现的催化前波,其反应机理为Eu(Ⅲ)在吸附了萘乙酸的汞电极上,形成电活性络合物,其它植物生长素如吲哚-3-乙酸、吲哚-3-丙酸、吲噪-3-丁酸等,都能与Eu(Ⅲ)形成类似的极谱催化前波,而使Eu(Ⅲ)的氧化还原反应变得比较可逆。

关键词: Eu(Ⅲ)-&alpha, -萘乙酸, 汞电极吸附性, 极谱催化前波

Abstract: A polarographic catalytic prewave of Eu(Ⅲ) with a-naphthaleneacetic acid(NAA) was obtained in a solution of 0. 2 mol/L NH4Ac-0. 05 mol/L K2SO4, pH 7. 0. The concentration of Eu(Ⅲ) from 3. 0 × 10-6to 1. 0 ×10-4mol/L, and that of NAA from 5. 0×10-6to 3. 0× 10-5mol/Lare directly proportional to the peak heights. The mechanism was investigated by several methods, such as linear sweep, cyclic voltammetry, ACpolarography, differential pulse polarography,etc.Wesuggest that NAAbe adsorbed on the surface of mercury electrode, and it complexes with Eu(Ⅲ) diffusing to the surface. The formation of complex on the mercury surface facilitates the reduction of Eu(Ⅲ). In the similar way, we have also obtained the catalytic prewaves of Eu(Ⅲ) with other auxins, such as indole-3-acetic acid (LAA), indole-3-propanoic acid(IPA) and indole-3-butanoic acid (IBA). The formation of polarographic prewaves could be useful to get some information about the additive effect of rare earths with auxins for promoting the growth of plant roots.

Key words: Eu(Ⅲ)-α-naphthaleneacetic acid, Adsorption on mercury electrode, Catalytic prewave

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