Thermal Transformations of α-H6P2Mo 18O62·nH2O Heteropolyacid Full article
Journal |
Russian Chemical Bulletin
ISSN: 1066-5285 , E-ISSN: 1573-9171 |
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Output data | Year: 2003, Volume: 52, Number: 1, Pages: 103-108 Pages count : 6 DOI: 10.1023/A:1022492114284 | ||
Tags | 31P NMR spectroscopy, Heteropolyacid, Thermogravimetric analysis, Thermolysis | ||
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Abstract:
According to the 31P NMR spectroscopy, heteropolyacid (HPA) H6P2Mo18O62·nH2O (P2Mo18), α-isomer of the Dawson structure, transforms upon heating above 80 °C partially (up to 30%) to γ-isomer, in which both polar groups Mo3O13 of the heteropolyanion are turned by 60° around the N3 axis, and partially to β-isomer in which only one group is turned. The β- and γ-isomers of P2Mo18 have been found for the first time. Their transformation into the α-isomer occurs upon rehydration in one week in air and in 1 h in an aqueous solution. HPA P2Mo18 decomposes on heating up to 350 °C to HPA H3PMo12O40 (PMo12) and a previously unknown phase of the HPMo6I21 composition, which in its turn decomposes at ∼375 °C to molybdenyl phosphates and IiI3. The PMo12 decomposition occurs via two routes to form the same products at temperatures of ∼400 and 450 °C with corresponding exotherms of IiI3 crystallization.
Cite:
Maksimovskaya R.I.
, Maksimov G.M.
, Litvak G.S.
Thermal Transformations of α-H6P2Mo 18O62·nH2O Heteropolyacid
Russian Chemical Bulletin. 2003. V.52. N1. P.103-108. DOI: 10.1023/A:1022492114284 WOS Scopus РИНЦ
Thermal Transformations of α-H6P2Mo 18O62·nH2O Heteropolyacid
Russian Chemical Bulletin. 2003. V.52. N1. P.103-108. DOI: 10.1023/A:1022492114284 WOS Scopus РИНЦ
Original:
Максимовская Р.И.
, Максимов Г.М.
, Литвак Г.С.
Термические превращения гетерополикислоты α-H6P2Mo18O62·nH2O
Известия Академии наук. Серия химическая. 2003. №1. С.97-102. РИНЦ
Термические превращения гетерополикислоты α-H6P2Mo18O62·nH2O
Известия Академии наук. Серия химическая. 2003. №1. С.97-102. РИНЦ
Dates:
Submitted: | Jun 20, 2001 |
Accepted: | Jul 19, 2002 |
Published print: | Jan 1, 2003 |
Identifiers:
Web of science | WOS:000181542300014 |
Scopus | 2-s2.0-0037284647 |
Elibrary | 13439768 |
Chemical Abstracts | 2003:125831 |
Chemical Abstracts (print) | 139:77806 |
OpenAlex | W2374152236 |