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ARSENIC(III) IODIDE

CAS No.
7784-45-4
Chemical Name:
ARSENIC(III) IODIDE
Synonyms
NA 1557;triiodoarsane;Triiodoarsine;Asenic lodide;Asenic Iodide;Arsenousiodide;ARSENIC IODIDE;Arsenous iodide;ARSENIC TRIIODIDE;Arsenoustriiodide
CBNumber:
CB7192357
Molecular Formula:
AsI3
Lewis structure
asi3 lewis structure
Molecular Weight:
455.64
MDL Number:
MFCD00014170
MOL File:
7784-45-4.mol
MSDS File:
SDS
TDS File:
TDS
Last updated:2026-06-23 16:59:16
Product description Number Pack Size Price
Arsenic(III) iodide 401145 5g $166
Arsenic(III) iodide 401145 25g $410
Arsenic(III) iodide, 98% 98% 93-3312 25g $596
Arsenic(III) iodide, 98% 98% 93-3312 100g $1783
Arsenic(III) iodide ≥99% 35408 1G $30
More product size

ARSENIC(III) IODIDE Properties

Melting point 146 °C
Boiling point 403 °C
Density 4.69 g/mL at 25 °C(lit.)
Flash point 424°C
solubility slightly soluble in H2O, ethanol, ethyl ether; soluble in benzene. toluene
form Powder
Specific Gravity 4.39
color red
Water Solubility Soluble in alcohol, ether, Carbon disulfide, water(6 g/100 m).
Specific Heat Capacity Cp(crystal): 0.23 J/(g·K); Cp(gas): 0.18 J/(g·K), at 25℃
Sensitive Moisture Sensitive
Merck 14,803
Exposure limits ACGIH: TWA 0.01 mg/m3
NIOSH: IDLH 5 mg/m3; Ceiling 0.002 mg/m3
Dielectric constant 7.0(150℃)
InChI 1S/AsI3/c2-1(3)4
InChIKey IKIBSPLDJGAHPX-UHFFFAOYSA-N
SMILES I[As](I)I
CAS DataBase Reference 7784-45-4(CAS DataBase Reference)
REACH Annex XVII Substances List Arsenic triiodide (7784-45-4)
EWG's Food Scores 1
FDA UNII 3029988O2T
EPA Substance Registry System Arsenous triiodide (7784-45-4)
UNSPSC Code 12352300
NACRES NA.22

SAFETY

Risk and Safety Statements

Symbol(GHS)  Skull and Crossbones (GHS06)Environment (GHS09)
GHS06,GHS09
Signal word  Danger
Hazard statements  H301-H331-H410
Precautionary statements  P264-P270-P261-P271-P273-P301+P310-P330-P304+P340-P311-P391-P405-P403+P233-P501
PPE Eyeshields, Faceshields, Gloves, type P2 (EN 143) respirator cartridges
Hazard Codes  T,N
Risk Statements  23/25-50/53
Safety Statements  20/21-28-45-60-61
RIDADR  UN 1557 6.1/PG 1
WGK Germany  3
RTECS  CG1950000
TSCA  TSCA listed
HazardClass  6.1
PackingGroup  II
Storage Class 6.1B - Non-combustible acute toxic Cat. 1 and 2
very toxic hazardous materials
Hazard Classifications Acute Tox. 3 Inhalation
Acute Tox. 3 Oral
Aquatic Acute 1
Aquatic Chronic 1
Hazardous Substances Data 7784-45-4(Hazardous Substances Data)
NFPA 704
0
3 0

ARSENIC(III) IODIDE price More Price(14)

Manufacturer Product number Product description CAS number Packaging Price Updated Buy
Sigma-Aldrich 401145 Arsenic(III) iodide 7784-45-4 5g $166 2023-01-07 Buy
Sigma-Aldrich 401145 Arsenic(III) iodide 7784-45-4 25g $410 2022-05-15 Buy
Strem Chemicals 93-3312 Arsenic(III) iodide, 98% 98% 7784-45-4 25g $596 2026-04-30 Buy
Strem Chemicals 93-3312 Arsenic(III) iodide, 98% 98% 7784-45-4 100g $1783 2026-04-30 Buy
Chem-Impex 35408 Arsenic(III) iodide ≥99% 7784-45-4 1G $30 2026-05-19 Buy
Product number Packaging Price Buy
401145 5g $166 Buy
401145 25g $410 Buy
93-3312 25g $596 Buy
93-3312 100g $1783 Buy
35408 1G $30 Buy

ARSENIC(III) IODIDE Chemical Properties,Uses,Production

Chemical Properties

red powder(s); enthalpy of formation 58.2 kJ/mol; entropy 213.0 J/(mol · K); enthalpy of vaporization 59.3 kJ/mol; decomposes slowly in air at 100°C, rapidly at 200°C, to give As, I2, As2O3; made by precipitation from a hot AsCl3-HCl solution by the addition of KI [KIR78] [STR93]

Uses

Formerly the compound was used in dermatitides.

Uses

Arsenic(III) iodide is useful for preparing organoarsenic compounds.

Definition

Includes any unique chemical substance that contains arsenic as part of the infrastructure of that chemical.

Preparation

Arsenic triiodide is prepared by treating elemental arsenic with a solution of iodine in carbon disulfide. Alternatively, it can be precipitated out from a hot solution of arsenic trioxide or arsenic trisulfide in hydrochloric acid on treatment with potassium or sodium iodide. Also, it is made by the reaction of arsenic trichloride with potassium iodide.

General Description

Orange-red rhombohedral crystals (from acetone). Density 4.69 g / cm3. Melting point 285.6°F (140.9°C). Red as a liquid.

Air & Water Reactions

Reacts slowly with oxygen from the air, liberating iodine [Merck]. Water soluble. Aqueous solutions are strongly acidic (pH of 0.1N solution about 1.1) and ultimately form HI and As2O3, although an equilibrium AsI3 + 3H2O = H3AsO3 + 3HI has been observed [Merck 1989].

Reactivity Profile

ARSENIC IODIDE gives acidic solutions in water. These solutions neutralize bases exothermically. Can react as either an oxidizing agent or reducing agent.

Hazard

Toxic and carcinogen.

Health Hazard

Highly toxic, may be fatal if inhaled, swallowed or absorbed through skin. Contact with molten substance may cause severe burns to skin and eyes. Avoid any skin contact. Effects of contact or inhalation may be delayed. Fire may produce irritating, corrosive and/or toxic gases. Runoff from fire control or dilution water may be corrosive and/or toxic and cause pollution.

Fire Hazard

Combustible material: may burn but does not ignite readily. Containers may explode when heated. Runoff may pollute waterways. Substance may be transported in a molten form.

reaction suitability

core: arsenic
reagent type: catalyst

Safety Profile

Inorganic compounds are confirmed human carcinogens producing tumors of the mouth, esophagus, larynx, bladder, and paranasal sinus. Recognized carcinogens of the skin, lungs, and liver. Used as insecticides, herbicides, silvicides, defoliants, desiccants, and rodenticides. Poisoning from arsenic compounds may be acute or chronic. Acute poisoning usually results from swallowing arsenic compounds; chronic poisoning from either swallowing or inhaling. Acute allergic reactions to arsenic compounds used in medical therapy have been fairly common, the type and severity of reaction depending upon the compound. Inorganic arsenicals are more toxic than organics. Trivalent is more toxic than pentavalent. Acute arsenic poisoning (from ingestion) results in marked irritation of the stomach and intestines with nausea, vomiting, and darrhea. In severe cases, the vomitus and stools are bloody and the patient goes into collapse and shock with weak, rapid pulse, cold sweats, coma, and death. Chronic arsenic poisoning, whether through ingestion or inhalation, may manifest itself in many different ways. There may be disturbances of the digestive system such as loss of appetite, cramps, nausea, constipation, or diarrhea. Liver damage may occur, resulting in jaundice. Disturbances of the blood, kidneys, and nervous system are not infrequent. Arsenic can cause a variety of skin abnormalities including itching, pigmentation, and even cancerous changes. A characteristic of arsenic poisoning is the great variety of sympt-oms that can be produced. Dangerous; when heated to decomposition, or when metallic arsenic contacts acids or acid fumes, or when water solutions of arsenicals are in contact with active metals such as Fe, Al, or Zn, highly toxic fumes of arsenic are emitted.

Purification Methods

It crystallises from acetone and sublimes below 100o. It is very slowly hydrolysed by H2O (much more slowly than the chloride). POISONOUS. [Schenk in Handbook of Preparative Inorganic Chemistry (Ed. Brauer) Academic Press Vol I p 597-598 1963.]

ARSENIC(III) IODIDE Preparation Products And Raw materials

Raw materials

Preparation Products

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