209651
Selenium
powder, −100 mesh, ≥99.5% trace metals basis
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Fórmula empírica (notación de Hill):
Se
Número CAS:
Peso molecular:
78.96
NACRES:
NA.23
PubChem Substance ID:
UNSPSC Code:
12161600
EC Number:
231-957-4
MDL number:
Servicio técnico
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gray
assay
≥99.5% trace metals basis
form
powder
reaction suitability
reagent type: catalyst
core: selenium
resistivity
1.2 μΩ-cm, 0°C
particle size
−100 mesh
bp
684.9 °C (lit.)
mp
217 °C (lit.)
density
4.81 g/mL at 25 °C (lit.)
SMILES string
[Se]
InChI
1S/Se
InChI key
BUGBHKTXTAQXES-UHFFFAOYSA-N
General description
Selenium powder is a fine, powdery substance made up of small particles of the element selenium, often produced by the reduction of selenium oxide. Selenium powder is grey or silvered-colored and may have a metallic sheen that may appear reddish in color. This product is passed through a 100-mesh sieve, indicating that the particles are small and have a diameter of around 150 micrometers or less, and ensuring the powder is fine and easy-to-handle.
Application
Se is used in the synthesis of CdSe, which is consequetively used to modulate the photoresponse of quantum dot solar cells by varying the size and shape of semiconductor nanostructures.
signalword
Danger
hcodes
Hazard Classifications
Acute Tox. 3 Inhalation - Acute Tox. 3 Oral - Aquatic Chronic 4 - STOT RE 2
Clase de almacenamiento
6.1C - Combustible acute toxic Cat.3 / toxic compounds or compounds which causing chronic effects
wgk
WGK 2
flash_point_f
Not applicable
flash_point_c
Not applicable
ppe
Eyeshields, Faceshields, Gloves, type P2 (EN 143) respirator cartridges
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István Robel et al.
Journal of the American Chemical Society, 128(7), 2385-2393 (2006-02-16)
By using bifunctional surface modifiers (SH-R-COOH), CdSe quantum dots (QDs) have been assembled onto mesoscopic TiO(2) films. Upon visible light excitation, CdSe QDs inject electrons into TiO(2) nanocrystallites. Femtosecond transient absorption as well as emission quenching experiments confirm the injection
Claire M Weekley et al.
Nutrients, 5(5), 1734-1756 (2013-05-24)
Determining the speciation of selenium in vivo is crucial to understanding the biological activity of this essential element, which is a popular dietary supplement due to its anti-cancer properties. Hyphenated techniques that combine separation and detection methods are traditionally and
Kai-Oliver Feldmann et al.
Chemistry (Weinheim an der Bergstrasse, Germany), 21(27), 9697-9712 (2015-05-12)
Although a fairly large number of binary group 15/16 element cations have been reported, no example involving phosphorus in combination with a group 16 element has been synthesized and characterized to date. In this contribution is reported the synthesis and structural characterization