ЕЛЕКТРОХІМІЧНІ ДОСЛІДЖЕННЯ ВЗАЄМОДІЇ СПОЛУК КОФЕЇНІЮ З ПОЛІАНІОНАМИ Мо ТА W З 1,3,5-ТРИФЕНІЛВЕРДАЗИЛЬНИМ РАДИКАЛОМ
The work continues the study on the peculiarities of the interaction of 1,3,7-trimethylxanthine (caffeine) compounds with polyoxometalates of molybdenum and tungsten with the artificial radical of 1,3,5- triphenylverdazyl (TFV). Using the example of a model reaction with the TFV radical, these compo...
Збережено в:
| Дата: | 2021 |
|---|---|
| Автори: | , , |
| Формат: | Стаття |
| Мова: | Англійська |
| Опубліковано: |
V.I.Vernadsky Institute of General and Inorganic Chemistry
2021
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| Онлайн доступ: | https://ucj.org.ua/index.php/journal/article/view/265 |
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| Назва журналу: | Ukrainian Chemistry Journal |
Репозитарії
Ukrainian Chemistry Journal| _version_ | 1856543759541469184 |
|---|---|
| author | Panteleieva , Olha Plyasovskaya , Kateryna Shtemenko, Olexandr |
| author_facet | Panteleieva , Olha Plyasovskaya , Kateryna Shtemenko, Olexandr |
| author_sort | Panteleieva , Olha |
| baseUrl_str | |
| collection | OJS |
| datestamp_date | 2021-01-21T08:30:30Z |
| description | The work continues the study on the peculiarities of the interaction of 1,3,7-trimethylxanthine (caffeine) compounds with polyoxometalates of molybdenum and tungsten with the artificial radical of 1,3,5- triphenylverdazyl (TFV). Using the example of a model reaction with the TFV radical, these compounds showed a special antiradical action. Based on the research results, it was found that the nature of the destruction of the radical when interacting with (HСaf)3[PМ12O40]∙6H2O (where М = Мо, W) differs from most known systems, which are characterized by a mechanism of disproportionation. The data obtained confirmed the previously made assumption about the chemical nature of these interactions. To establish the stoichiometry of the reaction between TFV and (HСaf)3[PW12O40], electrochemical studies were conducted which showed that the activity of the radical is restored after exceeding the concentration ratio of 12 : 1, respectively. The synergism of the components of the compound (HСaf)3[PW12O40] is shown: when TFV interacts with H3[PW12O40], the maximum cathode current characteristic of TFV occurs at a concentration ratio of 4 : 1, respectively, while caffeine has no antiradical effect at all. Previously obtained data from X-ray diffraction analysis of compounds (HСaf)3[PMo12O40]∙6H2O, (HСaf)3[PW12O40]∙6H2O prove that the orientation of protonated caffeine relative to polyoxamethalate-anion is possible due to hydrogen bonds =O…H–N=. This process can result in the delocalization of the charge over the entire O-enriched surface, by all twelve groups [О–Ме–О]-, which are part of the POM, making the latter active centers capable of interacting with TFV.
Therefore, the data presented correlate with the previously obtained results of spectrophotometric analysis and X-ray diffraction data and confirm the previously made conclusions. |
| first_indexed | 2025-09-24T17:43:36Z |
| format | Article |
| id | oai:ojs2.1444248.nisspano.web.hosting-test.net:article-265 |
| institution | Ukrainian Chemistry Journal |
| language | English |
| last_indexed | 2025-09-24T17:43:36Z |
| publishDate | 2021 |
| publisher | V.I.Vernadsky Institute of General and Inorganic Chemistry |
| record_format | ojs |
| spelling | oai:ojs2.1444248.nisspano.web.hosting-test.net:article-2652021-01-21T08:30:30Z ELECTROCHEMICAL INVESTIGATIONS OF THE INTERACTION OF CAFFEINIUM COMPOUNDS WITH POLYANІОNES OF Мо AND W WITH OF 1,3,5 - TRIPHENYL VERDAZYL RADICAL ЕЛЕКТРОХІМІЧНІ ДОСЛІДЖЕННЯ ВЗАЄМОДІЇ СПОЛУК КОФЕЇНІЮ З ПОЛІАНІОНАМИ Мо ТА W З 1,3,5-ТРИФЕНІЛВЕРДАЗИЛЬНИМ РАДИКАЛОМ Panteleieva , Olha Plyasovskaya , Kateryna Shtemenko, Olexandr polyoxometalates; 1,3,5-triphenyl-verdazyl radical; 1,3,7-trimethylxanthine; anti-radical action. The work continues the study on the peculiarities of the interaction of 1,3,7-trimethylxanthine (caffeine) compounds with polyoxometalates of molybdenum and tungsten with the artificial radical of 1,3,5- triphenylverdazyl (TFV). Using the example of a model reaction with the TFV radical, these compounds showed a special antiradical action. Based on the research results, it was found that the nature of the destruction of the radical when interacting with (HСaf)3[PМ12O40]∙6H2O (where М = Мо, W) differs from most known systems, which are characterized by a mechanism of disproportionation. The data obtained confirmed the previously made assumption about the chemical nature of these interactions. To establish the stoichiometry of the reaction between TFV and (HСaf)3[PW12O40], electrochemical studies were conducted which showed that the activity of the radical is restored after exceeding the concentration ratio of 12 : 1, respectively. The synergism of the components of the compound (HСaf)3[PW12O40] is shown: when TFV interacts with H3[PW12O40], the maximum cathode current characteristic of TFV occurs at a concentration ratio of 4 : 1, respectively, while caffeine has no antiradical effect at all. Previously obtained data from X-ray diffraction analysis of compounds (HСaf)3[PMo12O40]∙6H2O, (HСaf)3[PW12O40]∙6H2O prove that the orientation of protonated caffeine relative to polyoxamethalate-anion is possible due to hydrogen bonds =O…H–N=. This process can result in the delocalization of the charge over the entire O-enriched surface, by all twelve groups [О–Ме–О]-, which are part of the POM, making the latter active centers capable of interacting with TFV. Therefore, the data presented correlate with the previously obtained results of spectrophotometric analysis and X-ray diffraction data and confirm the previously made conclusions. V.I.Vernadsky Institute of General and Inorganic Chemistry 2021-01-15 Article Article Physical chemistry Физическая xимия Фізична xімія application/pdf https://ucj.org.ua/index.php/journal/article/view/265 10.33609/2708-129X.86.12.2020.124-133 Ukrainian Chemistry Journal; Vol. 86 No. 12 (2020): Ukrainian Chemistry Journal; 124-133 Украинский химический журнал; Том 86 № 12 (2020): Украинский химический журнал; 124-133 Український хімічний журнал; Том 86 № 12 (2020): Український хімічний журнал; 124-133 2708-129X 2708-1281 en https://ucj.org.ua/index.php/journal/article/view/265/146 |
| spellingShingle | Panteleieva , Olha Plyasovskaya , Kateryna Shtemenko, Olexandr ЕЛЕКТРОХІМІЧНІ ДОСЛІДЖЕННЯ ВЗАЄМОДІЇ СПОЛУК КОФЕЇНІЮ З ПОЛІАНІОНАМИ Мо ТА W З 1,3,5-ТРИФЕНІЛВЕРДАЗИЛЬНИМ РАДИКАЛОМ |
| title | ЕЛЕКТРОХІМІЧНІ ДОСЛІДЖЕННЯ ВЗАЄМОДІЇ СПОЛУК КОФЕЇНІЮ З ПОЛІАНІОНАМИ Мо ТА W З 1,3,5-ТРИФЕНІЛВЕРДАЗИЛЬНИМ РАДИКАЛОМ |
| title_alt | ELECTROCHEMICAL INVESTIGATIONS OF THE INTERACTION OF CAFFEINIUM COMPOUNDS WITH POLYANІОNES OF Мо AND W WITH OF 1,3,5 - TRIPHENYL VERDAZYL RADICAL |
| title_full | ЕЛЕКТРОХІМІЧНІ ДОСЛІДЖЕННЯ ВЗАЄМОДІЇ СПОЛУК КОФЕЇНІЮ З ПОЛІАНІОНАМИ Мо ТА W З 1,3,5-ТРИФЕНІЛВЕРДАЗИЛЬНИМ РАДИКАЛОМ |
| title_fullStr | ЕЛЕКТРОХІМІЧНІ ДОСЛІДЖЕННЯ ВЗАЄМОДІЇ СПОЛУК КОФЕЇНІЮ З ПОЛІАНІОНАМИ Мо ТА W З 1,3,5-ТРИФЕНІЛВЕРДАЗИЛЬНИМ РАДИКАЛОМ |
| title_full_unstemmed | ЕЛЕКТРОХІМІЧНІ ДОСЛІДЖЕННЯ ВЗАЄМОДІЇ СПОЛУК КОФЕЇНІЮ З ПОЛІАНІОНАМИ Мо ТА W З 1,3,5-ТРИФЕНІЛВЕРДАЗИЛЬНИМ РАДИКАЛОМ |
| title_short | ЕЛЕКТРОХІМІЧНІ ДОСЛІДЖЕННЯ ВЗАЄМОДІЇ СПОЛУК КОФЕЇНІЮ З ПОЛІАНІОНАМИ Мо ТА W З 1,3,5-ТРИФЕНІЛВЕРДАЗИЛЬНИМ РАДИКАЛОМ |
| title_sort | електрохімічні дослідження взаємодії сполук кофеїнію з поліаніонами мо та w з 1,3,5-трифенілвердазильним радикалом |
| topic_facet | polyoxometalates 1,3,5-triphenyl-verdazyl radical 1,3,7-trimethylxanthine anti-radical action. |
| url | https://ucj.org.ua/index.php/journal/article/view/265 |
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