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...
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| Datum: | 2021 |
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V.I.Vernadsky Institute of General and Inorganic Chemistry
2021
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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 |
| institution |
Ukrainian Chemistry Journal |
| baseUrl_str |
|
| datestamp_date |
2021-01-21T08:30:30Z |
| collection |
OJS |
| language |
English |
| topic_facet |
polyoxometalates 1,3,5-triphenyl-verdazyl radical 1,3,7-trimethylxanthine anti-radical action. |
| format |
Article |
| author |
Panteleieva , Olha Plyasovskaya , Kateryna Shtemenko, Olexandr |
| spellingShingle |
Panteleieva , Olha Plyasovskaya , Kateryna Shtemenko, Olexandr ЕЛЕКТРОХІМІЧНІ ДОСЛІДЖЕННЯ ВЗАЄМОДІЇ СПОЛУК КОФЕЇНІЮ З ПОЛІАНІОНАМИ Мо ТА W З 1,3,5-ТРИФЕНІЛВЕРДАЗИЛЬНИМ РАДИКАЛОМ |
| author_facet |
Panteleieva , Olha Plyasovskaya , Kateryna Shtemenko, Olexandr |
| author_sort |
Panteleieva , Olha |
| title |
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_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_sort |
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 |
| 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. |
| publisher |
V.I.Vernadsky Institute of General and Inorganic Chemistry |
| publishDate |
2021 |
| url |
https://ucj.org.ua/index.php/journal/article/view/265 |
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2025-09-24T17:43:36Z |
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2025-09-24T17:43:36Z |
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