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04004

Sigma-Aldrich

Phosphorus, red

≥97.0%

Synonym(s):
P
Empirical Formula (Hill Notation):
P
CAS Number:
Molecular Weight:
30.97
EC Number:
MDL number:
PubChem Substance ID:
NACRES:
NA.22

vapor density

0.02 (vs air)

Quality Level

vapor pressure

0.03 mmHg ( 21 °C)
1 mmHg ( 76.6 °C)

Assay

≥97.0%

autoignition temp.

500 °F

reaction suitability

reaction type: Buchwald-Hartwig Cross Coupling Reaction
reaction type: Heck Reaction
reaction type: Hiyama Coupling
reaction type: Negishi Coupling
reaction type: Sonogashira Coupling
reaction type: Stille Coupling
reaction type: Suzuki-Miyaura Coupling
reagent type: catalyst

resistivity

10 μΩ-cm, 20°C

mp

416 °C (subl.) (lit.)

density

2.34 g/mL at 25 °C (lit.)

cation traces

Fe: ≤2000 mg/kg

storage temp.

2-8°C

SMILES string

[P]

InChI

1S/P

InChI key

OAICVXFJPJFONN-UHFFFAOYSA-N

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This Item
902160298220214701
Phosphorus, red ≥97.0%

Sigma-Aldrich

04004

Phosphorus, red

Phosphorus pentoxide anhydrous, free-flowing, Redi-Dri™, ReagentPlus®, 99%

Sigma-Aldrich

902160

Phosphorus pentoxide

Phosphorus pentoxide powder, ACS reagent, ≥98.0%

Sigma-Aldrich

298220

Phosphorus pentoxide

Phosphorus pentoxide ReagentPlus®, 99%

Sigma-Aldrich

214701

Phosphorus pentoxide

reaction suitability

reaction type: Buchwald-Hartwig Cross Coupling Reaction, reaction type: Heck Reaction, reaction type: Hiyama Coupling, reaction type: Negishi Coupling, reaction type: Sonogashira Coupling, reaction type: Stille Coupling, reaction type: Suzuki-Miyaura Coupling, reagent type: catalyst

reaction suitability

-

reaction suitability

-

reaction suitability

-

mp

416 °C (subl.) (lit.)

mp

340 °C (lit.)

mp

340 °C (lit.)

mp

340 °C (lit.)

density

2.34 g/mL at 25 °C (lit.)

density

2.3 g/mL at 25 °C (lit.)

density

2.3 g/mL at 25 °C (lit.)

density

2.3 g/mL at 25 °C (lit.)

cation traces

Fe: ≤2000 mg/kg

cation traces

As: ≤100 mg/kg, Fe: ≤100 mg/kg, heavy metals (as Pb): ≤0.02%

cation traces

NH4+: ≤0.01%, heavy metals (as Pb): ≤0.01%

cation traces

As: ≤100 mg/kg, Fe: ≤100 mg/kg, heavy metals (as Pb): ≤0.02%

storage temp.

2-8°C

storage temp.

-

storage temp.

-

storage temp.

-

General description

Red phosphorus is the most common allotrope of phosphorus. It exists in an amorphous form and found to be more stable than white phosphorus. It is used in organic synthesis and chemical warfare including igniters, incendiaries, screening smoke ammunition and smoke signal. Red phosphorus is also used as a flame retardant in many thermoplastics and thermosetting plastics.

Application

Red phosphorus can be used as a:
  • Photocatalyst for the formation of H2 from water.
  • Catalyst in the synthesis of tris(2-pyridyl)phosphine by reacting with 2-bromopyridine in the presence of a base.
  • Flame retardant along with aluminum oxide in recycled poly(ethylene terephthalate).
  • Anode material in combination with carbon composites for sodium-ion batteries.

Pictograms

Flame

Signal Word

Warning

Hazard Statements

Hazard Classifications

Aquatic Chronic 3 - Flam. Sol. 2

Storage Class Code

4.1B - Flammable solid hazardous materials

WGK

WGK 3

Flash Point(F)

Not applicable

Flash Point(C)

Not applicable

Personal Protective Equipment

dust mask type N95 (US), Eyeshields, Gloves

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Tetrahedron Letters, 53(19), 2424-2427 (2012)
An amorphous red phosphorus/carbon composite as a promising anode material for sodium ion batteries
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New Evidence Concerning the Structure of Amorphous Red Phosphorus
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Angewandte Chemie (International Edition in English), 34(23-24), 2637-2638 (1996)
Phospham-A stable phosphorus-rich flame retardant
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Fire and Materials, 18(1), 1-7 (1994)
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