1746-01-6
Product Name:
2,3,7,8-TETRACHLORODIBENZO-P-DIOXIN
Formula:
C12H4Cl4O2
Synonyms:
2,3,7,8-TCDD
Inquiry
CHEMICAL AND PHYSICAL PROPERTIES
| Physical Description | 2,3,7,8-tetrachlorodibenzo-p-dioxin (tcdd) appears as white crystals or tan crystalline powder. (NTP, 1992) |
|---|---|
| Color/Form | Colorless needles |
| Boiling Point | Decomposes at 932 °F (NTP, 1992) |
| Melting Point | 563 °F (NTP, 1992) |
| Flash Point | 4 °C (39 °F) - closed cup |
| Solubility | less than 1 mg/mL at 77 °F (NTP, 1992) |
| Density | 1.8 g/cm³ |
| Vapor Pressure | 6.4e-10 mmHg at 68 °F ; 0.0000000014 mmHg at 77 °F (NTP, 1992) |
| LogP | log Kow = 6.8 |
| Stability/Shelf Life | Changed chemically when exposed in isooctane or n-octanol to UV light. |
| Decomposition | /2,3,7,8-Tetrachlorodibenzo-p-dioxin/ begins to decompose at 500 °C and virtually complete decomposition occurs within 21 seconds at a temp of 800 °C. |
| Kovats Retention Index | 2336 |
| Other Experimental Properties | Needles, mp 295 °C; ... crystals from anisol, mp 320-325 °C |
| Chemical Classes | Other Classes -> Halogenated Polyaromatics |
SAFETY INFORMATION
| Signal word | Danger |
|---|---|
| Pictogram(s) |
 Flame Flammables GHS02  Exclamation Mark Irritant GHS07  Health Hazard GHS08  Environment GHS09 |
| GHS Hazard Statements |
H225:Flammable liquids H304:Aspiration hazard H315:Skin corrosion/irritation H336:Specific target organ toxicity,single exposure; Narcotic effects H373:Specific target organ toxicity, repeated exposure H410:Hazardous to the aquatic environment, long-term hazard |
| Precautionary Statement Codes |
P210:Keep away from heat/sparks/open flames/hot surfaces. — No smoking. P260:Do not breathe dust/fume/gas/mist/vapours/spray. P280:Wear protective gloves/protective clothing/eye protection/face protection. P301+P310:IF SWALLOWED: Immediately call a POISON CENTER or doctor/physician. P370+P378:In case of fire: Use … for extinction. P403+P235:Store in a well-ventilated place. Keep cool. |
COMPUTED DESCRIPTORS
| Molecular Weight | 322.0 g/mol |
|---|---|
| XLogP3 | 6.4 |
| Hydrogen Bond Donor Count | 0 |
| Hydrogen Bond Acceptor Count | 2 |
| Rotatable Bond Count | 0 |
| Exact Mass | 321.893590 g/mol |
| Monoisotopic Mass | 319.896540 g/mol |
| Topological Polar Surface Area | 18.5 Ų |
| Heavy Atom Count | 18 |
| Formal Charge | 0 |
| Complexity | 259 |
| Isotope Atom Count | 0 |
| Defined Atom Stereocenter Count | 0 |
| Undefined Atom Stereocenter Count | 0 |
| Defined Bond Stereocenter Count | 0 |
| Undefined Bond Stereocenter Count | 0 |
| Covalently-Bonded Unit Count | 1 |
| Compound Is Canonicalized | Yes |
PRODUCT INTRODUCTION
description
2,3,7,8-tetrachlorodibenzo-p-dioxin (tcdd) appears as white crystals or tan crystalline powder. (NTP, 1992)