Characterizations and morphology of sodium tungstate particles
2018年8月8日 · Preliminary X-ray studies revealed that the compound has a cubic structure at room temperature. The formation of the compound has been confirmed by X-ray powder diffraction studies and Raman spectroscopy.
Synthesis, molecular structure and chemical properties of a …
Acidification of K10A-α- [SiW9O34] in aqueous solution leads to the formation of α- [Si2W18O66]16−, built up from two A-α- {SiW9O34} subunits, which reacts with metal cations to form potassium and mixed potassium–transition metal complexes.
Cation-Directed Synthesis of Tungstosilicates. 2. Synthesis, Structure ...
Nine resonance signals have been observed with the tetrabutylammonium salt in dimethylformamide/acetonitrile solution, in agreement with the crystal structure of the anion which consists of two A-α-[SiW 9 O 34] 10-associated through two W−O−W junctions. This anion derives from the Wells−Dawson structure by breaking four W−O−W junctions.
A contribution to the physicochemical characterization of ...
2007年6月20日 · Nonstoichiometric cesium and rubidium salts of tungstosilicic acid (TSA) were synthesized by precipitation. These solids are insoluble in water, due to the low solvation energy of large cations, have high specific surface area, and a mainly microporous structure.
Synthesis, molecular structure and chemical properties of a new ...
2003年9月2日 · Comparison of this octanuclear TbIII complex of 2-picolinate and tungstoarsenate ligands with a dinuclear relative reveals the role of the organic ligands as chromophores, identifies the luminescent Tb centers, and determines the relationship between POM coordination mode and luminescence quenching.
Bronze sodium tungsten precipitation synthesis and lithium ...
2024年10月19日 · Hexagonal sodium tungsten bronze (h-NaxWO3+x/2·yH2O) nanorods were obtained by simple acid precipitation in 16 min at 97 °C, evidencing the saving of time and energy. The W-OH2 modes were observed in Raman and Fourier transform infrared (FTIR) spectra to confirm the presence of structural water.
Vibration Spectroscopy Stability Investigation of 12 …
2014年5月25日 · In the spectrum of the precipitate, a strong band at about 970 cm –1 shows the presence of the monolacunary anion as a dominant species besides the Keggin anion. The formation of precipitate may be explained by the lower solubility of the sodium salt of tungstosilicate as well as the sodium salt of monolacunary tungstosilicate.
Cation-Directed Synthesis of Tungstosilicates. 1. Syntheses and ...
2003年9月1日 · The structure of 1 was determined by single-crystal X-ray diffraction and further characterized by IR spectrum, UV-vis spectra, and diffuse reflectance spectrum.
NiII 36‐Containing 54‐Tungsto‐6‐Silicate: Synthesis, Structure ...
2021年11月11日 · The structure of Ni 36 can be rationalized as a cyclic assembly of six identical {Ni 6 SiW 9} units, which are oriented in alternating up/down orientations, resulting in a structure with S 6 symmetry.
Synthesis and characterization of new tungstosilicate aggregates ...
2008年1月1日 · Herein, we report the synthesis, structure and characterization of two new polytungstosilicate compounds: K 4 Na 11 Li 5 [Si 3 W 26 O 94] · ∼21H 2 O (1) and K 5 Na 11 [Si 2 W 19 O 69 (H 2 O)] · ∼22H 2 O (2).