کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
220333 463328 2008 4 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Electrochemistry of the sterically hindered imidazolidine zwitterion and its paramagnetic derivative
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی مهندسی شیمی (عمومی)
پیش نمایش صفحه اول مقاله
Electrochemistry of the sterically hindered imidazolidine zwitterion and its paramagnetic derivative
چکیده انگلیسی

To investigate the redox properties of the stable paramagnetic anion 4,4,5,5-tetramethyl-2-oxoimidazolidine-3-oxide-1-olate (1−) and 4,4,5,5-tetramethyl-1,2-dioxoimidazolidin-1-ium-3-olate (zwitterions 2) we used the combined cyclic voltammetry and ESR method. It was found that the electrochemical reduction of the zwitterion in CH3CN (−0.35 V) occurred reversibly and gave 1−. When the cathode potential increased further to −0.95 V, anion 1− was irreversibly reduced to 4,4,5,5-tetramethyl-2-oxoimidazolidine-1,3-diolate (32−), which comproportionated with 2 and was again converted into 1−. It was also found that treatment of the zwitterion with a sevenfold excess of KOH led to its complete disappearance and formation of 1−. Under these conditions, 1− underwent reversible one-electron reduction (−0.55 V) and irreversible oxidation; the latter process occurred when low potentials were applied (∼0.05 V).

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Electroanalytical Chemistry - Volume 624, Issues 1–2, 1 December 2008, Pages 69–72
نویسندگان
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