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inquiryName: Tungsten atomic absorption standard solution CAS: 7440-33-7 Molecular Formula: W Molecular Weight: 183.84 Application:Fine chemical
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inquirytungsten
Conditions | Yield |
---|---|
With hydrogen byproducts: NaOH, H2O; redn. at 1100°C; | 100% |
With hydrogen byproducts: Na, O2; no reaction until 700°C, 900°C; | 100% |
With hydrogen byproducts: Na, O2; no reaction until 700°C, 900°C; | 100% |
tungsten
Conditions | Yield |
---|---|
in hydrogen stream at 900°C; | 100% |
in hydrogen stream at 900°C; | 100% |
Conditions | Yield |
---|---|
2000°C, fast react.; | A n/a B 100% |
2000°C, fast react.; | A n/a B 100% |
1200°C, 2 h; | A n/a B 60% |
1200°C, 2 h; | A n/a B 60% |
tungsten
Conditions | Yield |
---|---|
With magnesium In solid byproducts: MgO; (Ar) milled at room temp. and reaction times from few min up to several h; leached (HCl) under stirring; centrifuged; wached (HCl); wached several times (water); dried at 120°C (air); | 84% |
With hydrogen fluoride In not given Electrolysis; in 4.6 n soln. at 95°C, 0.65-1A per cm2 on mercury cathode, with H2SO4 and HCl complete scale pptn.; | 20% |
With hydrogen fine powder at 80 atm, 550-600°C; |
tungsten(VI) chloride
tungsten
Conditions | Yield |
---|---|
With magnesium hydride In toluene byproducts: H2; (argon); refluxing WCl6 and MgH2 in toluene in a mill under continuous grinding (8.5 h); washing (toluene), trituration with EtOH, filtration, boiling with concd. HCl, filtration, washing (H2O; EtOH), drying; | 82.9% |
on annealing single crystal tungsten wire covered with Mo single crystal layer; | |
pptn. on glowing tungsten wire in vac. at 1600-1700 °C; |
Conditions | Yield |
---|---|
redn. at beginning red heat, leaching with water; | 61.03% |
redn. at beginning red heat, leaching with water; | 61.03% |
incomplete reaction at red head;; | |
incomplete reaction at red head;; |
Conditions | Yield |
---|---|
at 600℃; for 12h; Milling; Sealed tube; | A 60% B n/a |
tungsten hexacarbonyl
1-[{[Bis-(2-diethylphosphanyl-ethyl)-phosphanyl]-methyl}-(2-diethylphosphanyl-ethyl)-phosphanyl]-2-diethylphosphanyl-ethane
W2(CO)7(C19H43P5)
fac,fac-(tungsten)2(carbonyl)6(eHTP)
C
tungsten
Conditions | Yield |
---|---|
In xylene N2- or Ar atmosphere; addn. of W(CO)6 and org. compd. to xylol, refluxing (5 d); cooling, evapn. (vac.), filtn., dissoln. CH2Cl2, filtn., recrystn. (CH2Cl2/toluene); | A 40% B n/a C n/a |
Conditions | Yield |
---|---|
In neat (no solvent, solid phase) heating of WSe2 single crystal flakes enclosed in envelopes made by thin Ta plates by passing current; | A 30% B n/a |
In neat (no solvent, solid phase) heating single crystal flakes of WSe2 by current in high vac.; |
tungsten hexacarbonyl
Hexamethylbenzene
A
W(CO)3(η6-Me6C6)
B
tungsten
Conditions | Yield |
---|---|
In decane under Ar, educts added to n-decane, slowly heated to reflux, refluxed for 20 h with periodical shaking, cooled; filtered through SiO2 with CH2Cl2, evapd. in vac., crystals filtered, washed with pentane, dried in vac.; | A 28% B n/a |
Conditions | Yield |
---|---|
With calcium carbide byproducts: CaO, CO; Electric Arc; redn. with carbide ferrosilicium mixt. in elec. oven or arc at 2800-2900°C; carbon free tungsten; | |
With calcium carbide In melt | |
In melt in elec. oven; |
Conditions | Yield |
---|---|
With calcium carbide In melt | |
In melt in elec. oven; |
Conditions | Yield |
---|---|
With hydrogenchloride In water adding HCl, pptn.; | |
With HCl In water adding HCl, pptn.; |
Conditions | Yield |
---|---|
In further solvent(s) Electrolysis; melt composition: NaCl (39.5 wt-%), Na3AlF6 (39.5 wt-%), WO3 (1.0 wt-%),B2O3 (20.0 wt-%), 950°C, graphite crucible (container and anode) , W- or Ni-bars as cathode, U=4.0 V, t=20 min; products sepn. by hot water and 10% H2SO4 at 50-70°C; powder XRD; |
Conditions | Yield |
---|---|
In further solvent(s) Electrolysis; melt composition: NaCl (39.5 wt-%), Na3AlF6 (39.5 wt-%), WO3 (1.0 wt-%),B2O3 (20.0 wt-%), 950°C, graphite crucible (container and anode) , W- or Ni-bars as cathode, U=4.0 V, t=10 min; products sepn. by hot water and 10% H2SO4 at 50-70°C; powder XRD; |
Conditions | Yield |
---|---|
In further solvent(s) Electrolysis; melt composition: NaCl (39.5 wt-%), Na3AlF6 (39.5 wt-%), WO3 (1.0 wt-%),B2O3 (20.0 wt-%), 950°C, graphite crucible (container and anode) , W- or Ni-bars as cathode, U=4.0 V, t=30 min; products sepn. by hot water and 10% H2SO4 at 50-70°C; powder XRD; |
Conditions | Yield |
---|---|
In further solvent(s) Electrolysis; melt composition: NaCl (39.5 wt-%), Na3AlF6 (39.5 wt-%), WO3 (1.0 wt-%),B2O3 (20.0 wt-%), 950°C, graphite crucible (container and anode) , W- or Ni-bars as cathode, U=4.0 V, t=5 min; |
Conditions | Yield |
---|---|
byproducts: N2, NaCl; vac., heating in ampoule (300-400°C); cooling, washing (MeOH), drying (vac.), powder XRD, FT IR; |
tungsten
Conditions | Yield |
---|---|
In melt Electrolysis; neutral or light alk. raw material, 900-1000°C, 60-80% yield of current, light pptn. of tungsten powder or single crystal; 99.3% tungsten content, impurities: SiO2 and alk.; | |
With hydrogen | 0% |
In melt Electrochem. Process; electrodeposition (LiF-KF eutectic melt, 973 K); scanning electron microscopy, electron probe anal.; |
Conditions | Yield |
---|---|
In melt Electrolysis; neutral or light alk. raw material, 900-1000°C, 60-80% yield of current, light pptn. of tungsten powder or single crystal; 99.3% tungsten content, impurities: SiO2 and alk.; | |
In melt Electrolysis; m. 500°C, 6 A per cm2; product mixt. of α and β modifikation; |
Conditions | Yield |
---|---|
In further solvent(s) Electrolysis; in furfural soln.; | 0% |
tungsten
Conditions | Yield |
---|---|
repeated thermic and mech. treatments; carbon free product; | |
heating; | |
repeated thermic and mech. treatments; carbon free product; | |
heating; |
Conditions | Yield |
---|---|
With manganese(IV) oxide violent aluminothermic react.; very pure product by dissolving other metals from tungsten manganese alloy; |
Conditions | Yield |
---|---|
With hydrogen mixing of WO3 with soln. of additives, drying paste and redn. at 1000°C; |
Conditions | Yield |
---|---|
In melt Electrolysis; electrolysis in NaCl electrolyte under Ar, cathode current density of 0.2 A/cm**2, anode current density of 0.04 A/cm**2, at 850-950°C; emf: 1.2-1.8 V; |
Conditions | Yield |
---|---|
In neat (no solvent) Electrolysis; 1123 - 1173 K, U = 1.9 V; |
Conditions | Yield |
---|---|
In melt Electrolysis; on tungsten single crystal cathode at 900°C, 6 or 8 angular single crystal formation; |
Conditions | Yield |
---|---|
In neat (no solvent) Electrolysis; 1 mol % of carbonate, 1123 - 1173 K, U = 1.9 V; |
Conditions | Yield |
---|---|
In melt Electrolysis; with lower current density, with higher current density bronze formation; |
Conditions | Yield |
---|---|
In melt stoich. amts. of La2O3, S, W, WO3, Co mixed with KCl flux; sealed in carbon coated SiO2 ampoule under vac.; heated from 200 to 400°C in 24 h; held for 48 h; heated to 950°C in 12 h; held for 120 h; cooled to room temp. within 24 h; soaked in H2O overnight; washed with H2O; detn. by EDX, XRD; | 100% |
Conditions | Yield |
---|---|
In neat (no solvent) in an inert atmosphere under N2; 850°C for 30 min; before use NaFdried at 300°C overnight (vac.), recrystd. from molten state; | 98% |
Conditions | Yield |
---|---|
With Br2 In neat (no solvent) heating in an evacuated sealed quartz ampoule at 300°C for 48 h, stirring thoroughly and heating for another 72 h; opening, washing of the solid with CHCl3 and hot benzene and drying (vac.); elem. anal.; | 97% |
Conditions | Yield |
---|---|
In neat (no solvent) in an inert atmosphere under N2; 850°C for 30 min; before use KF dried at 300°C overnight (vac.), recrystd. from molten state; K2WF8 identified by Raman spectrum; | A n/a B 97% |
Conditions | Yield |
---|---|
In neat (no solvent) in an inert atmosphere under N2; 800°C for 2 h; RbF before use dried in situ at 600°C for 5 h (vac.) before addition WF6; | 96% |
Conditions | Yield |
---|---|
In melt Electric Arc; ingots by arc melting of Ni(75)-Cr(2.5)-Al(20)-W(2.5) (at%), several remelts, sealed in silica tube under vac. with partial pressure of Ar, 1573K (2 weeks), furnace cooled to 1523K, 4 weeks, 1273K (6 weeks), quenched in iced water; electron microscopy, electron probe microanalysis, x-ray diffraction; | A 95% B 5% |
tungsten(VI) fluoride
cesium fluoride
tungsten
cesium hexafluorotungstate(V)
Conditions | Yield |
---|---|
In neat (no solvent) in an inert atmosphere under N2; 800°C for 2 h; CsF before use dried in situ at 600°C for 5 h (vac.) before addition WF6; | 94% |
Conditions | Yield |
---|---|
In sulfur dioxide Sonication; condensing WF6 onto a frozen mixture (10ml) of W(C5H5)Cl2 and activated W in SO2 at -196°C; warming react. mixture to room temp., stirring, 30min in an ultrasonic bath; allowing to react, 12h;; filtration; removal of sulfur dioxide; elem. anal.; IR;; | 94% |
tungsten
Conditions | Yield |
---|---|
With CH3OH; Br2 In methanol byproducts: CH3OBr, HCOOCH3, H2O; a mixt. of Br2, MeOH and powdered W was stirred at 45-60°C for 12 h, additional Br2 may be added; further by-products; rinsed with MeOH, filtered, dried in vac.; | 93% |
With CH3OH; Br2 In methanol byproducts: HBr, (CH3)2O, CH3Br; a mixt. of Br2, MeOH and powdered W was stirred at 45-60°C for 12 h, additional Br2 may be added; further by-products; rinsed with MeOH, filtered, dried in vac.; | 93% |
Conditions | Yield |
---|---|
In toluene ultrasoning mixing soln. of org. polymer and W (30 min); solvent removal (vac.); residue breaking; pyrolysis to 1500°C (argon stream, 5°C/min, 4 h hold); X-ray diffraction; | 93% |
Conditions | Yield |
---|---|
In 1,2-dichloro-ethane at 20℃; for 17h; | 93% |
Conditions | Yield |
---|---|
With 65percent HNO3; HF In hydrogen fluoride aq. HF; dissolution of W powder in 40% HF and 65% HNO3, slow addn. of (C(NH2)3)2CO3 in 40% HF under stirring; filtn., washing with water, drying in air, elem. anal.; | 92% |
disulfur dichloride
sulfur
tungsten
tungsten(VI) sulfide tetrachloride
Conditions | Yield |
---|---|
In neat (no solvent) heating (2E-4 Torr, 425°C, 48 h), slow cooling; | 89% |
Conditions | Yield |
---|---|
In toluene ultrasoning mixing soln. of org. polymer and W (30 min); solvent removal (vac.); residue breaking; pyrolysis to 800°C (ammonia stream, 5°C/min, 4 h hold); further heating to 1500°C (5°C/min, argon stream); X-ray diffraction; | 89% |
Conditions | Yield |
---|---|
at 1350℃; for 4h; Inert atmosphere; | A 85% B 15% |
In neat (no solvent, solid phase) react. of tungsten and silicon above 1070 K; | |
In melt under Ar; mixt. of W and Si melted in siliconized graphite crucible at 2100°C; held no longer than 2 min with vibration stirring; detd. by X-ray microanalysis; |
Conditions | Yield |
---|---|
In water Electrolysis; electrolysis of H2O2 and HF solns. for 120 min (anode: metal rod, cathode: Pt foil), voltage 5-10 V, current 0.05 A, temp. 0-5°C, soln. remained colorless; filtered, addn. of KF in HF, pptn., filtered, washed with ethanol, dried over KOH; elem. anal.; | 84% |
In water metal dissolved in a mixt. of HF and H2O2 solns. with stirring, temp. maintained below 10°C; filtered, addn. of KF in HF; | 60-70 |
methanol
tungsten
A
tungsten hexamethoxide
B
tungsten oxomethoxide
Conditions | Yield |
---|---|
With LiCl In methanol Electrochem. Process; anodic oxidation of W in MeOH in the presence of LiCl (110 V, 12 h); evapn. to dryness (vac.), extn. (hexane), drying (vac.); mixture of the 2 compds.; | A 81% B 17% |
Conditions | Yield |
---|---|
With bromine In tetrachloromethane | 80% |
Conditions | Yield |
---|---|
In melt stoich. amts. of La2O3, S, W, WO3, Mn mixed with KCl flux; sealed in carbon coated SiO2 ampoule under vac.; heated from 200 to 400°C in 24 h; held for 48 h; heated to 950°C in 12 h; held for 120 h; cooled to room temp. within 24 h; soaked in H2O overnight; washed with H2O; detn. by EDX, XRD; | 80% |
Conditions | Yield |
---|---|
In melt stoich. amts. of La2O3, S, W, WO3, Ni mixed with KCl flux; sealed in carbon coated SiO2 ampoule under vac.; heated from 200 to 400°C in 24 h; held for 48 h; heated to 950°C in 12 h; held for 120 h; cooled to room temp. within 24 h; soaked in H2O overnight; washed with H2O; detn. by EDX, XRD; | 80% |
Conditions | Yield |
---|---|
In melt stoich. amts. of La2O3, S, W, WO3, Cr mixed with KCl flux; sealed in carbon coated SiO2 ampoule under vac.; heated from 200 to 400°C in 24 h; held for 48 h; heated to 950°C in 12 h; held for 120 h; cooled to room temp. within 24 h; soaked in H2O overnight; washed with H2O; detn. by EDX, XRD; | 80% |
Conditions | Yield |
---|---|
In melt stoich. amts. of La2O3, S, W, WO3, Fe mixed with KCl flux; sealed in carbon coated SiO2 ampoule under vac.; heated from 200 to 400°C in 24 h; held for 48 h; heated to 950°C in 12 h; held for 120 h; cooled to room temp. within 24 h; soaked in H2O overnight; washed with H2O; detn. by EDX, XRD; | 80% |
Conditions | Yield |
---|---|
-196°C; not isolated, detected by NMR; | A 10% B <1 C 20% D 70% |
Conditions | Yield |
---|---|
In neat (no solvent) byproducts: WBr4, WO2Br2; W powder and Br2 in evacuated and sealed ampule cooled to liq. N2; I endof ampole heated to 750°C, II - to 40°C; WBr5 formed; the n ampole heated at gradient of 750-540°C for 40 h, cooled to roomtemp.; purified by sublimation at 540°C in dynamic vac.; detd. by powderXRD; | 67% |
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