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Isomerically Pure α1-Monosubstituted Tungstodiphosphates: Synthesis, Characterization and Stability in Aqueous Solutions

✍ Scribed by Roland Contant; Martine Richet; Yu Wei Lu; Bineta Keita; Louis Nadjo

Publisher
John Wiley and Sons
Year
2002
Tongue
English
Weight
175 KB
Volume
2002
Category
Article
ISSN
1434-1948

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✦ Synopsis

Isomerically pure samples of α 1 -P 2 W 17 O 61 M were prepared, in which M represents Ca II and mainly the first-row transition metal cations: Mn II , Fe III , Co II , Ni II , Cu II , Zn II . The formula is α 1 -P 2 W 17 O 62 M for V V and Mo VI . The compounds were characterised by elemental analysis, IR, UV/Vis and 31 P NMR spectroscopy. The stability of these complexes was monitored by cyclic voltammetry and/or UV/Vis spectroscopy. All the compounds proved to be stable for at least 24 h in a pH = 3 medium, even in the presence of 0.2 M Na + , except for the precursor lacunary species itself and the Ca II -substituted derivative. In this medium, the transformation of the lacunary heteropolyanion yielded a mixture of α-[P 2 W 18 O 62 ] 6-and

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