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Send EmailIodine, Iodine Crystals, Prilled Iodine, Elemental Iodine, 7553-56-2, 12190-71-5
Iodine – CAS 7553-56-2
Basic Chemical Information
| Property | Value |
|---|---|
| CAS Number | 7553-56-2 |
| Chemical Name | Iodine, Molecular Iodine, Diiodine |
| Molecular Formula | I₂ |
| Molecular Weight | 253.81 g/mol |
| EC Number | 231-442-4 |
| Appearance | Dark violet crystals or prilled beads |
| Odor | Sharp, characteristic iodine smell |
| Solubility | Slightly soluble in water; soluble in ethanol, chloroform, ether |
| Melting Point | 113 °C |
| Boiling Point | 184 °C |
| Density | 4.93 g/cm³ |
| Vapor Pressure | 0.31 mmHg at 25 °C |
| pH (saturated sol.) | ~5.4 |
Sectoral Usage Table – CAS 7553-56-2
| Sector | Application | Notes |
|---|---|---|
| Chemical Industry | Reagent, catalyst, intermediate | Used in organic synthesis and halogenation reactions |
| Pharmaceutical | Tincture iodine, iodophor production, API synthesis | Required for antiseptic formulations and iodine-based drugs |
| Laboratory | Titration reagent, iodine value determination | Used in redox reactions and analytical chemistry |
| Agriculture | Feed additive, micronutrient | Prevents iodine deficiency in livestock |
| Food Industry | Iodized salt production | Complies with WHO/FAO and Codex Alimentarius standards |
| Photography | Film and developer chemistry | Historical use in silver halide processing |
| Pigments/Dyes | Iodine-based pigment synthesis | Used in specialty colorants |
| Hygiene/Disinfection | Raw material for povidone iodine | Active iodine source in antiseptic production |
| Analytical Chemistry | Starch test, solubility analysis | Forms blue-violet complex with starch |
| Trade & Customs | Export/import of technical iodine (USP/ACS grades) | CAS 7553-56-2 required in customs and MSDS documentation |
Mandatory Usage Sectors – CAS 7553-56-2
| Sector | Mandatory Use Reason | Regulatory or Technical Basis |
|---|---|---|
| Pharmaceutical Production | API synthesis, antiseptic formulations | USP/EP standards require pure iodine for tinctures and iodophors |
| Laboratory Analysis | Titration, iodine number determination | ISO and ASTM methods specify iodine as reference reagent |
| Food Additive Manufacturing | Iodized salt production | WHO/FAO and Turkish Food Codex mandate iodine content in table salt |
| Animal Feed Production | Micronutrient additive | Ministry of Agriculture regulations require iodine supplementation |
| Hygiene & Disinfection | Povidone iodine manufacturing | Formulation standards require elemental iodine as active source |
| Analytical Chemistry | Starch testing, solubility profiling | Standard methods use iodine for qualitative analysis |
| Trade & Customs | Technical iodine classification | CAS 7553-56-2 must be declared in customs and safety documentation |
Chemical Identity
| Property | Value |
|---|---|
| CAS Number | 12190-71-5 |
| Chemical Name | Iodine, Elemental Iodine |
| Molecular Formula | I₂ |
| Molecular Weight | 253.81 g/mol |
| EC Number | 231-442-4 |
| SMILES | II |
| InChIKey | PNDPGZBMCMUPRI-UHFFFAOYSA-N |
Physical Properties
-
Appearance: Black to violet crystalline powder or granules
-
Crystal Structure: Monoclinic or orthorhombic (depending on grade)
-
Melting Point: ~113 °C
-
Boiling Point: ~184 °C
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Solubility: Poor in water (0.03 g/100 mL); soluble in ethanol, ether, chloroform, acetone
-
Dielectric Constant: ~11.0 (ambient)
Sectoral Applications – CAS 12190-71-5
| Sector | Application | Notes |
|---|---|---|
| Chemical Synthesis | Halogenation, catalyst, intermediate | Used in organic reactions requiring high-purity iodine |
| Pharmaceutical | API synthesis, iodine-based formulations | Meets pharmacopoeia standards for iodine content |
| Laboratory | Analytical reagent, iodine value testing | Used in HPLC, LC-MS, and redox titrations |
| Electronics | Semiconductor etching, iodine doping | Applied in specialty materials and thin film processes |
| Food & Feed | Micronutrient additive | Used in fortified salt and animal feed (regulated use) |
| Disinfection | Raw material for povidone iodine | Serves as iodine source in antiseptic production |
| Customs & Trade | Export/import of iodine granules | CAS 12190-71-5 required in customs declarations and MSDS |
Regulatory & Mandatory Use
-
FDA Listings: 21 CFR 101.9, 104.20, 107.10, 107.100, 310.545, 582.80
-
UNII Code: 9679TC07X4
-
ATC Code: D08AG03 (Antiseptics)
-
EWG Food Score: 2–5 (depending on formulation)
This form of iodine is often preferred for high-purity applications, especially in pharmaceutical synthesis, analytical chemistry, and regulated feed additives. If you'd like, I can now prepare a bilingual comparison table between CAS 7553-56-2 and CAS 12190-71-5 for catalog or audit use
Synonyms and Trade Names for CAS 12190-71-5
| Synonym / Trade Name | Context / Usage |
|---|---|
| Iodine | General name for elemental iodine |
| Diatomic Iodine | Structural reference (I₂ molecule) |
| Iodine Crystals or Liquid | Commercial form description |
| Iodine Solution Standard Substance | Analytical reagent grade |
| Iodine Test Solution (ChP) | Chinese Pharmacopoeia reference |
| Iodine (JP15/USP) | Japanese and US Pharmacopoeia grade |
| Iodine Base | Raw material designation |
| HX968 | Internal or catalog code used by suppliers |
| TIANFU-CHEM Iodine | Supplier-specific trade name |
| Iodien | German variant spelling |
| Iodide (I21-) (8CI,9CI) | Registry variant (not to be confused with iodide ion) |
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