A HPLC-ICP-AES technique for the screening of [XW11NbO40]: N - Aqueous solutionsстатья
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Web of Science ,
Scopus
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Дата последнего поиска статьи во внешних источниках: 7 марта 2019 г.
Авторы:
Shmakova A.A. ,
Akhmetova M.M. ,
Volchek V.V. ,
Romanova T.E. ,
Korolkov I. ,
Sheven D.G. ,
Adonin S.A. ,
Abramov P.A. ,
Sokolov M.N.
Журнал:
New Journal of Chemistry
Том:
42
Номер:
10
Год издания:
2018
Издательство:
Royal Society of Chemistry
Местоположение издательства:
United Kingdom
Первая страница:
7940
Последняя страница:
7948
DOI:
10.1039/c7nj04702a
Аннотация:
The reaction of H3[PW12O40] with (NH4)[NbO(C2O4)2(H2O)2]·3H2O leads to the straightforward incorporation of Nb into a Keggin anion backbone resulting in [PW11NbO40]4- in nearly quantitative yield. Solution behavior of this monosubstituted anion as a function of pH was studied through 31P NMR and HPLC-ICP-AES techniques (a combination of chromatography and ICP-AES). Increasing of the pH leads to the elimination of Nb from the structure with the formation of mixed Nb/W Lindqvist-type anions and monolacunary [PW11O39]7-. In aged solutions of [PW11NbO40]4- the formation of a mixture of [PNb2W10O39]5- isomers was detected. The HPLC-ICP-AES technique was applied for the study of [BW11O39]9- behavior in aqueous solutions at different pH values and for monitoring the [GeW11O39]4- reaction with the niobium oxalate complex. Despite the presence of the nucleophilic NbO group [PW11NbO40]4- does not coordinate Co2+ in DMF or Ni2+ in CH3CN, producing double [Co(DMF)6][PW11NbO40]В·2.6DMF (2) and [Ni(CH3CN)5.5(H2O)0.5]2[PW11NbO40]В·1.7CH3CN (3) salts instead. В© 2018 The Royal Society of Chemistry and the Centre National de la Recherche Scientifique.
Добавил в систему:
Адонин Сергей Александрович