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Tungsten(VI) oxide, also known as tungsten trioxide is a chemical compound of oxygen and the transition metal tungsten, with formula WO 3. The compound is also called tungstic anhydride , reflecting its relation to tungstic acid H 2 WO 4 .
Tungsten has several oxidation states, and therefore oxides: Tungsten(III) oxide; Tungsten(IV) oxide, also known as tungsten dioxide; Tungsten(VI) oxide, also known as tungsten trioxide; Tungsten pentoxide
Tungstic acid refers to hydrated forms of tungsten trioxide, WO 3. Both a monohydrate (WO 3 ·H 2 O) and hemihydrate (WO 3 · 1 / 2 H 2 O) [1] are known. Molecular species akin to sulfuric acid, i.e. (HO) 2 WO 2 are not observed. The solid-state structure of WO 3 ·H 2 O consists of layers of octahedrally coordinated WO 5 (H 2 O) units where 4 ...
Tungsten hexachloride is readily hydrolyzed, even by moist air, giving the orange oxychlorides WOCl 4 and WO 2 Cl 2, and subsequently, tungsten trioxide. WCl 6 is soluble in carbon disulfide, carbon tetrachloride, and phosphorus oxychloride. [2] Methylation with trimethylaluminium affords hexamethyl tungsten: WCl 6 + 3 Al 2 (CH 3) 6 → W(CH 3 ...
Tungsten(III) oxide (W 2 O 3) is a compound of tungsten and oxygen. It has been reported (2006) as being grown as a thin film by atomic layer deposition at temperatures between 140 and 240 °C using W 2 (N(CH 3 ) 2 ) 6 as a precursor. [ 1 ]
Sodium tungstate is obtained by digestion of tungsten ores, the economically important representatives of which are tungstates, in base. Illustrative is the extraction of sodium tungstate from wolframite: [1] Fe/MnWO 4 + 2 NaOH + 2 H 2 O → Na 2 WO 4 ·2H 2 O + Fe/Mn(OH) 2. Scheelite is treated similarly using sodium carbonate.
Tungsten is a mostly non-reactive element: it does not react with water, is immune to attack by most acids and bases, and does not react with oxygen or air at room temperature. At elevated temperatures (i.e., when red-hot) it reacts with oxygen to form the trioxide compound tungsten(VI), WO 3.
Tungsten(IV) oxide is the chemical compound with the formula W O 2. The bronze-colored solid crystallizes in a monoclinic cell. [1] The rutile-like structure features distorted octahedral WO 6 centers with alternate short W–W bonds (248 pm). [1] Each tungsten center has the d 2 configuration, which gives the material a high electrical ...
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