Arsenic dioxide

Names
IUPAC name

Arsenic(III,V) dioxide

Identifiers

CAS Number

* 17306-35-3 N[EPA]

3D model (JSmol)

* Interactive image

ChemSpider |

* 139256

PubChem CID

* 158274

InChI

* InChI=1S/AsO2/c2-1-3

Key: LZYIDMKXGSDQMT-UHFFFAOYSA-N

* InChI=1/AsO2/c2-1-3

Key: LZYIDMKXGSDQMT-UHFFFAOYAF

SMILES

* O=[As][O]

Properties

Chemical formula

| AsO2 (As2O4)
Molar mass | 106.920 g/mol
Hazards
NIOSH (US health exposure limits):

PEL (Permissible)

| [1910.1018] TWA 0.010 mg/m3[1]

REL (Recommended)

| Ca C 0.002 mg/m3 [15-minute][1]

IDLH (Immediate danger)

| Ca [5 mg/m3 (as As)][1]

Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).

Infobox references

Arsenic dioxide is an inorganic compound with the chemical formula As2O4, containing As(III) and As(V), AsIIIAsVO4.[2]

## Synthesis

It can be synthesized in an autoclave via the following reaction:

2 As2O3 \+ O2 → 2 As2O4

## Structure

It adopts a layer structure, and the coordination geometry of As(III) is triangular pyramid while As(V) is tetrahedral.[2]

## References

1. ↑ 1.0 1.1 1.2 NIOSH Pocket Guide to Chemical Hazards. "#0038". National Institute for Occupational Safety and Health (NIOSH). https://www.cdc.gov/niosh/npg/npgd0038.html.
2. ↑ 2.0 2.1 Jones, P. G.; Beesk, W.; Sheldrick, G. M.; Sharman, E. (14 February 1980). "Arsenic dioxide". Acta Crystallographica Section B 36 (2): 439–440. doi:10.1107/S0567740880003433.

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*[CID]: Compound ID