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There are works that doubt the stability of the Wells–Dawson type heteropoly complex P2Mo18O62 in aqueous solutions. Therefore, investigate of the aqueous solutions stability of this substance is relevant. For this purpose, the synthesis of 18–molybdodiphosphate was carried out. It has been confirmed that synthesis with the use of fractional deposition allows obtaining this substance without additional purification operations. It simplifies synthesis and increases the yield of matter. Elemental analysis of the synthesized substance confirmed the formula of the resulting salt (NH4)6P2Mo18O62∙14H2O. In the IR spectrum of synthesized 18–molybdophosphate, the main characteristic bands of oscillations of atoms are observed at 1076, 950, 770–780 and 870 cm. In the spectrum on P nuclei, a band with a chemical shift at –2.84 p.p.m. is observed, which coincides with the literature data. Registered NMR spectra of 18–molybdophosphate on N nuclei indicate the presence in the molecule of ammonium salt of inhomogenous NH ions. This phenomenon can be explained by the asymmetric distribution of a negative charge on Oxygen atoms due to chiral distortion. Two– and four–electronic recovery products were synthesized. NMR P spectra of their aqueous solutions were registered to confirm their individuality. In the NMR P spectrum of a two–electron heteropoly blue, the shift of the main signal in a weak field (–1.0 p.p.m.) is observed. This is confirmed by the fact that the joining of two electrons to the molecule of 18–molybdophosphate occurs in one of the two halves of the molecule, most likely, is a belt of six octahedra MoO6, and their delocalization occurs on the MoO6 belt of the second half. When the reducing agent concentration was increased in the P NMR spectrum is observed two signals with chemical displacements –1.0 p.p.m. (two–electron heteropoly blue) and more intense at – 3.9 p.p.m. (four–electron heteropoly blue). In P NMR spectra of solid heteropoly blue with an increase in the number of attached to the anion electrons, there is a displacement of one band in a stronger field and a less pronounced displacement of the other band in more weak region.

vìsnik nacìonalʹnogo tehnìčnogo unìversitetu "hpì". novì rìšennâ v sučasnih tehnologìâh/vestnik nacionalʹnogo tehničeskogo universiteta "hpi". novye rešeniâ v sovremennyh tehnologiâh

Synthesis and physico–chemical research of 18–molibdophosphate and its reduced forms