Equilibria in the acidified aqueous dimethylformamide solutions of tungstate anion. Synthesis, crystal structure and characterization of novel decatungstate [Ba(H₂O)₂(C₃H₇NO)₃]₂[W₁₀O₃₂]∙(C₃H₇NO)₂

Abstract

To cite this article: Olena Yu. Poimanova, Sergii V. Radio, Katerina Ye. Bilousova, Vyacheslav N. Baumer & Georgiy M. Rozantsev (2014): Equilibria in the acidified aqueous-dimethylformamide solutions of tungstate-anion. Synthesis, crystal structure and characterization of decatungstate [BaThe formation and transformation of isopolytungstates in the system Na 2 WO 4 -HCl -NaCl -DMF -H 2 O with different dimethylformamide (DMF) concentrations have been studied by single-point pH-potentiometric titration and the subsequent modeling of the equilibria processes. The modeling of equilibria resulted in data necessary to synthesize barium decatungstate, [Ba(H 2 O) 2 (C 3 H 7 NO) 3 ] 2 [W 10 O 32 ]·(C 3 H 7 NO) 2 . The salt was characterized by elemental and EDX spectral analysis, SEM, FTIR spectroscopy, thermal analysis, single-crystal X-ray diffraction analysis in solid state, and by UV-Vis. spectroscopy in solution.

Synthesis and characterization of new hybrid decatungstate anions (CTAB)4W10O32 : toward heterogeneous photocatalysis

“…shows the well-known absorptions bands of decatungstate [43,44]. The absorption band at 424.3 cm -1 is assigned to W-O-W scissoring, the others at 578.6, 771.47, 833.18 and 902.62 cm -1 are assigned to W-Ocorner-shard-W and W-Oedge-shard-W stretching in the decatungstate framework, and the intense band at 964.33 cm -1 is assigned to the stretching of W=Oterminal [42,[45][46][47]. Two bands are well resolved for the bending vibrations of water.…”

“…Na4W10O32.xH2O (W10) was prepared following literature procedures [42] with large modifications. First, a boiled aqueous solution of Na2WO4.2H2O (66 g in 400 mL) and HCl (1 M in 400 mL) were mixed for 20 seconds under strong stirring, then the mixture was cooled rapidly to 0°C.…”