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Sigma-Aldrich

Ammonium metatungstate hydrate

99.99% trace metals basis

Sinónimos:

Ammonium tungsten oxide hydrate, Hexaammonium wolframate hydrate

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25 G
US$ 272,00

US$ 272,00

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25 G
US$ 272,00

About This Item

Fórmula lineal:
(NH4)6H2W12O40 · xH2O
Número de CAS:
12333-11-8
Peso molecular:
2956.30 (anhydrous basis)
Número CE:
234-733-4
Número MDL:
MFCD00150662
Código UNSPSC:
12352302
ID de la sustancia en PubChem:
24870120
NACRES:
NA.23

US$ 272,00

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Solicitar un pedido a granel

grado

for analytical purposes

Ensayo

99.99% trace metals basis

Formulario

powder

idoneidad de la reacción

reagent type: catalyst
core: tungsten

impurezas

≤150.0 ppm Trace Metal Analysis

mp

100 °C (dec.) (lit.)

cadena SMILES

N.N.N.N.N.N.O.O[W]1O[W](O)(=O)(O1)O[W]2(=O)(=O)O[W](O)(=O)(O2)O[W]3(=O)(=O)O[W](O)(=O)(O3)O[W]4(=O)(=O)O[W](O)(=O)(O[W]5(=O)(=O)O[W](O)(=O)(O[W]6(=O)(=O)O[W](O)(O)O6)O5)O4

InChI

1S/6H3N.9H2O.32O.12W/h6*1H3;9*1H2;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;/q;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;6*+1;+2/p-8

Clave InChI

ZBHPUDGBNLMJQH-UHFFFAOYSA-F

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Descripción general

Ammonium metatungstate is a Keggin-type heteropoly compound. It can be prepared by polycondensation of ammonium tungstate solutions. It is widely used as a precursor for preparing tungsten catalysts for hydrocracking and as a fuel cell catalyst.

Aplicación

Ammonium metatungstate can be used as a precursor to synthesize:
  • Carbon-supported tungsten catalyst for hydrogenolysis of cellulose.
  • Reduced tungsten and mixed tungsten oxide catalysts for bifunctional hydroisomerization of n-alkanes.
  • Hybrid 2D/3D tungsten diselenide transistors via chemical vapor deposition method.

Pictogramas

CorrosionExclamation mark
GHS05,GHS07

Palabra de señalización

Danger

Frases de peligro

H302,H318

Consejos de prudencia

P280 - P305 + P351 + P338

Clasificaciones de peligro

Acute Tox. 4 Oral - Eye Dam. 1

Código de clase de almacenamiento

11 - Combustible Solids

Clase de riesgo para el agua (WGK)

WGK 2

Punto de inflamabilidad (°F)

Not applicable

Punto de inflamabilidad (°C)

Not applicable

Equipo de protección personal

dust mask type N95 (US), Eyeshields, Gloves

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Certificados de análisis (COA)

Lot/Batch Number
0000425006
0000425006
0000325011
MKCV7949
0000325011

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By understanding how the environmental composition impacts the optoelectronic properties of transition metal dichalcogenide monolayers, we demonstrate that simple photoluminescence (PL) measurements of tungsten disulfide (WS2) monolayers can differentiate relative humidity environments. In this paper, we examine the PL and
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Questions

1–2 of 2 Questions  

  1. How can I determine the shelf life / expiration / retest date of this product?

    1 answer

    1. If this product has an expiration or retest date, it will be shown on the Certificate of Analysis (COA, CofA). If there is no retest or expiration date listed on the product's COA, we do not have suitable stability data to determine a shelf life. For these products, the only date on the COA will be the release date; a retest, expiration, or use-by-date will not be displayed.
      For all products, we recommend handling per defined conditions as printed in our product literature and website product descriptions. We recommend that products should be routinely inspected by customers to ensure they perform as expected.
      For products without retest or expiration dates, our standard warranty of 1 year from the date of shipment is applicable.
      For more information, please refer to the Product Dating Information document: https://www.sigmaaldrich.com/deepweb/assets/sigmaaldrich/marketing/global/documents/449/386/product-dating-information-mk.pdf

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  2. How is shipping temperature determined? And how is it related to the product storage temperature?

    1 answer

    1. Products may be shipped at a different temperature than the recommended long-term storage temperature. If the product quality is sensitive to short-term exposure to conditions other than the recommended long-term storage, it will be shipped on wet or dry-ice. If the product quality is NOT affected by short-term exposure to conditions other than the recommended long-term storage, it will be shipped at ambient temperature. As shipping routes are configured for minimum transit times, shipping at ambient temperature helps control shipping costs for our customers. For more information, please refer to the Storage and Transport Conditions document: https://www.sigmaaldrich.com/deepweb/assets/sigmaaldrich/marketing/global/documents/316/622/storage-transport-conditions-mk.pdf

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