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本文利用“补偿法”测定了电对 Fe(phen)3_-~(3+)/Fe(phen)3_-~(2+)和 Cu(phen)3_-~(2+)/Cu(phen)_-2~+(phen 为邻菲绕啉)的标准电极电位。前者1. 0636伏,后者为0. 0144伏,说明经邻菲绕啉络合后,提高了 Fe(Ⅲ)的氧化能力,相反降低了 Cu(Ⅱ)的氧化能力。由于 Fe 电对的测定值基本与文献报导相近,故方法是可靠的。对于半反应 Fe(phen)_3~(3+)+e≒Fe(phen)_3~(2+)的标准电极电位数据,已有报导,但对半反应 Cu(phen)_3~(2+)+e≒Cu(phen)_2~+的标准电极电位及测定方法尚未见报导。本文应用“补偿法”测电动势的方法,验证了铁离子邻菲绕啉络合电对的标准电极电位,同时测定了铜离子邻菲绕啉络合电对的标准电极电位。
In this paper, the “compensation method” was used to determine the effect of Fe (phen) 3_- ~ (3 +) / Fe (phen) 3_- ~ 2+ and Cu (phen) 3_- ~ (2 +) / Cu _-2 ~ + (phen phenanthroline) standard electrode potential. The former is 1. 0636 V, the latter is 0. 0144 V, indicating that the complexation of phenanthroline increases the oxidation ability of Fe (Ⅲ) and conversely decreases the oxidation ability of Cu (Ⅱ). Since the measured values of Fe pairs are basically similar to those reported in the literature, the method is reliable. It has been reported that the standard electrode potential data of Fe (phen) 3 + (3 +) + Fe (phen) 3 + (2+) + e ≒ Cu (phen) _2 ~ + standard electrode potential and measurement methods have not been reported. In this paper, we use the “compensation method” to measure the electromotive force. The standard electrode potentials of ferric phenanthroline complexation pairs are verified, and the standard electrode potentials of the copper (II) phenanthroline complex pairs are also determined.