|
ИСТИНА |
Войти в систему Регистрация |
ИСТИНА ФИЦ ПХФ и МХ РАН |
||
Electrochemistry of low soluble poly(trifluoromethylated) carbon nanospheres: S6-C60(CF3)12 and Cs-C70(CF3)20 casesстатья Исследовательская статья
Статья опубликована в высокорейтинговом журнале
Статья опубликована в журнале из списка Web of Science и/или Scopus- Авторы: Kosaya Maria P., Romanova Natalia A., Lukonina Natalia S., Goryunkov Alexey A.
- Журнал: Electrochimica Acta
- Том: 524
- Год издания: 2025
- Издательство: Elsevier BV
- Местоположение издательства: Netherlands
- Номер статьи: 146045
- DOI: 10.1016/j.electacta.2025.146045
- Аннотация: The thermodynamically most stable trifluoromethylfullerene S6-C60(CF3)12 and per(trifluoromethyl)fullerene Cs-C70(CF3)20-II with largest covering of the fullerene cage by trifluoromethyl groups are important cases of nanoscale fluorous spheroidal molecules with the well-defined structures. Lack solubility of these compounds in common solvents hampering their studying and further processing in liquid phase. We showed that these compounds are fairly soluble in octafluorotoluene and octafluorotoluene/ortho-dichlorobenzene (OFT/oDCB, 1:1 v/v) mixed solvent (0.47±0.09 and 0.39±0.08 mg mL–1 at RT for S6-C60(CF3)12). Unexpectedly, we found that S6-C60(CF3)12 molecules tends to aggregate in OFT/oDCB solution, forming particles about 120–130 nm in size, whose diffusion coefficient is two order of magnitude lower compared to C60. Electrochemical behavior of the fullerene compounds was studied using OFT/oDCB solvent, which the available potential window spans 3.2 V from +1.2 to –2.0 V vs Fc+/0. Two reduction waves at –1.34 and –1.80 V vs Fc+/0 were observed for S6-C60(CF3)12, evidencing that the S6-C60(CF3)12 is an outstanding example of perfluorinated fullerene derivatives with the lowest electron withdrawing ability in solution (–0.33 V relatively C600/– couple). Per(trifluoromethyl)fullerene Cs-C70(CF3)20-II demonstrates dissociative reduction at the first reduction potential (–1.17 V vs Fc+/0) yielding the cyclopentadienyl-stabilized C70(CF3)19– anion. Practically reversible re-oxidation of C70(CF3)19– anions occurs at +0.7 V vs Fc+/0, that indicates the formation of persistent C70(CF3)19• radicals. The simple rules to predict tendency of poly(trifluoromethylated) fullerenes toward the dissociative reduction were formulated using the experimental and theoretical data.
- Добавил в систему: Горюнков Алексей Анатольевич
Прикрепленные файлы
| № | Имя | Описание | Имя файла | Размер | Добавлен |
|---|