Uncatalyzed and Ruthenium(III) Catalyzed Oxidation of Aspartame by Potassium Permanganate in Aqueous Alkaline Medium: A Comparative Kinetic Study
作者:Laxmi Jattinagoudar、Sharanappa Nandibewoor、Shivamurti Chimatadar
DOI:10.1007/s10953-016-0455-0
日期:2016.4
reaction kinetics and mechanism of the oxidation of aspartame by permanganate ion in the absence and presence of ruthenium(III) in alkaline media has been studied spectrophotometrically at 298 K and at a constant ionic strength of 1.10 mol·dm−3. The uncatalyzed and catalyzed reaction has a stoichiometry, 1:2 (aspartame:$$ \textMnO}}_4}^ - } $$MnO4-). The oxidation products, $$ \textMnO}}_4}^2 -
在碱性介质中,在 298 K 和 1.10 mol·dm-3 的恒定离子强度下,分光光度法研究了碱性介质中高锰酸根离子氧化阿斯巴甜的反应动力学和机制。未催化和催化反应的化学计量比为 1:2(阿斯巴甜:$$ \textMnO}}_4}^ - } $$MnO4-)。通过光谱研究表征氧化产物 $$ \textMnO}}_4}^2 - } $$MnO42- 和 6-benzyl-3-hydroxy-3-methylpiperazine-2,5-dione。$$ \textMnO}}_4}^ - } $$MnO4- 浓度的顺序是统一的,而阿斯巴甜的浓度在未催化和催化反应中小于统一。碱金属 KOH 浓度变化,发现随着 KOH 浓度的增加,在不存在或存在催化剂的情况下,速率以小于单位级的顺序增加。钌 (III) 浓度的顺序是统一的。发现物质 [Ru(H2O)5OH]2+ 是钌 (III)