Arsenic(III) iodide
Arsenic(III) iodide (CAS 7784-45-4), with the chemical formula AsI3, is a dense, yellow crystalline solid. Possessing a molecular weight of 455.64 g/mol, it serves as a valuable reagent in inorganic synthesis and catalysis. Its applications extend to materials science and research, where its unique chemical properties are leveraged for specialised chemical transformations and the development of novel materials.
- IUPAC
- Arsenic triiodide,Arsenous iodide,Triiodoarsine
- Synonyms
- Arsenic triiodideArsenous iodideTriiodoarsine

Inorganic Synthesis
Arsenic(III) iodide is employed as a precursor in the synthesis of various arsenic-containing inorganic compounds. It is also used in the preparation of metal halides for applications in catalysis.
Materials Science Research
This compound can be utilised in the research and development of new materials, including those with specific electronic or optical properties. Its crystalline nature makes it of interest for crystal growth studies.
Catalysis
Arsenic(III) iodide finds application as a catalyst or catalyst precursor in specific organic and inorganic chemical reactions. Its role can facilitate or influence reaction pathways.
Chemical Reagent
As a laboratory reagent, Arsenic(III) iodide is used in various analytical and synthetic procedures where precise control over arsenic speciation is required.
| Molecular weight | 455.64 |
|---|---|
| Linear formula | AsI3 |
| Density | 4.69 g/mL at 25 °C(lit.) |


Hazard statements
- H301Toxic if swallowed
- H410Very toxic to aquatic life with long-lasting effects
Precautionary statements
- P261Avoid breathing dust, fume, gas or vapours
- P273Avoid release to the environment
- P301IF SWALLOWED
- P311Call a POISON CENTER or doctor
- P501Dispose of contents and container per local regulations
| Protective equipment | Eyeshields, Faceshields, Gloves, type P2 (EN 143) respirator cartridges |
|---|---|
| Transport (UN / ADR) | UN 1557 6.1 / PGI |
| Water hazard class (WGK, DE) | 3 |
| Hazard codes (EU) | T,N |
| Risk statements (R) | 23/25-50/53 |
| Safety statements (S) | 20/21-28-45-60-61 |
Hazard information is provided for guidance. Always consult the product Safety Data Sheet (SDS), available on request, before handling.
Documentation
Every batch ships with a Certificate of Analysis covering assay, identity and purity; the grade is confirmed against your enquiry. Safety Data Sheets and technical data sheets are available on request.
Supply & logistics
Samples for technical evaluation; bulk MOQ by grade and packaging. In-stock material ships in 7–10 working days, worldwide, with full export documentation.
What is Arsenic(III) iodide used for?
+
Arsenic(III) iodide is used in inorganic synthesis, materials science research, as a catalyst, and as a general chemical reagent in laboratory settings.
What is the CAS number and formula for Arsenic(III) iodide?
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The CAS number is 7784-45-4 and the chemical formula is AsI3.
What grade and purity does Tech Serve Solutions supply?
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Tech Serve Solutions supplies Arsenic(III) iodide, typically as a technical or research grade chemical. We do not represent this product as USP, BP, or EP grade unless explicitly stated otherwise in product specifications.
How is Arsenic(III) iodide handled and shipped?
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Arsenic(III) iodide is classified as toxic and an environmental hazard. Handling requires appropriate personal protective equipment including eyeshields, faceshields, gloves, and P2 respirator cartridges. It is shipped as a dangerous good under UN 1557, Hazard Class 6.1, Packing Group I.
How do I request a sample or quote for Arsenic(III) iodide?
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To request a sample or a quote for Arsenic(III) iodide, please contact our sales team directly through the TSS website or by phone.
Is Arsenic(III) iodide a controlled substance?
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Based on the provided data, Arsenic(III) iodide (CAS 7784-45-4) is classified as toxic and hazardous. Further regulatory information may be available upon specific enquiry.
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