Arsenic tetroxide

Arsenic tetroxide
Names
	IUPAC name Arsenic(III,V) dioxide
Identifiers
CAS Number	17306-35-3 [EPA];
3D model (JSmol)	Interactive image;
ChemSpider	139256;
PubChem CID	20288961;
CompTox Dashboard (EPA)	DTXSID601356581 DTXSID50938283, DTXSID601356581 ;
	InChI InChI=1S/2As.4O/q+3;+5;;;; Key: RAKBAHUVRSFKQD-UHFFFAOYSA-N;
	SMILES [O]=[As][O][As](=O)=O;
Properties
Chemical formula	As2O4
Molar mass	213.839 g·mol−1
Hazards
	NIOSH (US health exposure limits):
PEL (Permissible)	[1910.1018] TWA 0.010 mg/m3
REL (Recommended)	Ca C 0.002 mg/m3 [15-minute]
IDLH (Immediate danger)	Ca [5 mg/m3 (as As)]
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

Arsenic tetroxide is an inorganic compound with the chemical formula As₂O₄, containing As(III) and As(V), As^IIIAs^VO₄.^[2]

Synthesis

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

2 As
₂O
₃ + O
₂ → 2 As
₂O
₄

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

^ ^a ^b ^c NIOSH Pocket Guide to Chemical Hazards. "#0038". National Institute for Occupational Safety and Health (NIOSH).
^ ^a ^b 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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