Hydrolysis of Heteropoly Acid H3PW12O40 by 31P NMR Научная публикация
Журнал |
Russian Journal of Inorganic Chemistry
ISSN: 0036-0236 , E-ISSN: 1531-8613 |
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Вых. Данные | Год: 1998, Том: 43, Номер: 12, Страницы: 1825-1837 Страниц : 13 | ||
Авторы |
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Организации |
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Информация о финансировании (2)
1 | International Science Foundation | RA 8000 |
2 | International Science Foundation | RA 8300 |
Реферат:
Titration of aqueous solutions of heteropoly acid H(3)PW(12)O(40) (PW(12)) with bases M = Li(+), Na(+), K(+), Mg(2+), and Ca(2+), in the ranges of pH 1.5-9 and [PW(12)] = 0.002-0.1 mol/l was monitored by (31)P NMR. The first stage of basic hydrolysis is partially irreversible, and its ultimate products are the complexes of the heteropoly anion PW(11)O(39)(7-) with cations PW(11)M(I). The conversion of PW(12) to I and the reverse conversion occur at pH ca. 1.5-4 through three intermediate species, found in dilute solutions of PW(12)(<= 0.01 mol/1): PW(11)H(n) (n > 1) (II) and two complexes of PW(11) with W of tentative composition PW(11)WO(2) (III) and (PW(11))(2)WO(2) (IV), which appear virtually concurrently. At the second stage (pH > 7, [PW(12)] = 0.01 mol/l) complexes I decompose to PO(4)(3-) and WO(4)(2-), either directly (for M = Li, Na) or through the intermediate formation of primarily monomeric HPAs PW with W/P < 11 (for M = K, Mg). The heteropoly acid PW(12) is highly stable to acid hydrolysis and remains nonprotonated in rather concentrated solutions of mineral acids.
Библиографическая ссылка:
Maksimovskaya R.I.
Hydrolysis of Heteropoly Acid H3PW12O40 by 31P NMR
Russian Journal of Inorganic Chemistry. 1998. V.43. N12. P.1825-1837. WOS Scopus РИНЦ
Hydrolysis of Heteropoly Acid H3PW12O40 by 31P NMR
Russian Journal of Inorganic Chemistry. 1998. V.43. N12. P.1825-1837. WOS Scopus РИНЦ
Оригинальная:
Максимовская Р.И.
Исследование гидролиза гетерополикислоты H3PW12O40 методом ЯМР 31Р
Журнал неорганической химии. 1998. Т.43. №12. С.1960-1972. Scopus РИНЦ
Исследование гидролиза гетерополикислоты H3PW12O40 методом ЯМР 31Р
Журнал неорганической химии. 1998. Т.43. №12. С.1960-1972. Scopus РИНЦ
Даты:
Поступила в редакцию: | 30 дек. 1996 г. |
Опубликована в печати: | 1 дек. 1998 г. |
Идентификаторы БД:
Web of science | WOS:000207059100006 |
Scopus | 2-s2.0-0003619328 |
РИНЦ | 13291948 |