Welcome to LookChem.com Sign In|Join Free

Product Name

  • or
Home > Products > 

Diiodoacetylene

  • Name Diiodoacetylene
  • EINECSN/A
  • CAS No. 624-74-8
  • Density3.367g/cm3
  • PSA0.00000
  • LogP1.77480
  • SolubilityN/A
  • Melting Point81.5°C
  • FormulaC2I2
  • Boiling Point190.4°Cat760mmHg
  • Molecular Weight277.831
  • Flash Point94.1°C
  • Transport InformationN/A
  • AppearanceN/A
  • SafetyAn explosive sensitive to impact, crushing, or heating to 84°C. When heated to decomposition it emits toxic fumes of I. See also IODIDES and ACETYLENE COMPOUNDS and ALKYNES.
  • Risk CodesN/A
  • Molecular Structure
    Molecular Structure of 624-74-8 (diiodoacetylene)
  • Hazard SymbolsHighly volatile. Toxic by inhalation; vapors irritating to eyes and mucous membranes.
  • SynonymsHighly volatile. Toxic by inhalation; vapors irritating to eyes and mucous membranes.
  • Article Data57

Diiodoacetylene Chemical Properties

Chemistry informtion about Diiodoacetylene (CAS NO.624-74-8) is:
IUPAC Name: 1,2-Diiodoethyne
Synonyms: Diiodoacetylene ; Diiodoethyne
MF: C2I2
MW: 277.830340 g/mol 
Density: 3.367 g/cm3
Flash Point: 94.1 °C
Boiling Point: 190.4 °C at 760 mmHg
Vapour Pressure: 0.75 mmHg at 25°C 
Enthalpy of Vaporization: 40.92 kJ/mol
Following is the molecular structure of Diiodoacetylene (CAS NO.624-74-8) is:

Diiodoacetylene Safety Profile

An explosive sensitive to impact, crushing, or heating to 84°C. When heated to decomposition it emits toxic fumes of I. See also IODIDES and ACETYLENE COMPOUNDS and ALKYNES.

Diiodoacetylene Standards and Recommendations

DOT Classification:  Forbidden

Diiodoacetylene Analytical Methods

Preperation of Diiodoacetylene (CAS NO.624-74-8) is:
This preperation is a slightly modified version of that of Dehn (ref. 1). 3g of potassium iodide was dissolved into 40ml of distilled water in a 100ml measuring cylinder. A steady stream of acetylene produced by calcium carbide in water was bubbled through the potassium iodide solution. A 12.5% solution of sodium hypochlorite was slowly dripped into the bubbling potassium iodide solution where by the solution turned reddish amber, then turning pale yellow. The slow addition of hypochlorite was continued until a floculent white precipitate of diiodoacetylene fills the measuring cylinder and the hypochlorite addition no longer turns the solution yellow (figure 1).
The precipitate was filtered, flushed with cold water and dried in a cardboard box since diiodoacetylene is light sensitive. Its also volatile and will be lost through sublimation if left uncovered.
The slow addition of the hypochlorite is used to produce the unstable hypoiodite, which reacts with the acetylene to produce diiodoacetylene. The equations for the reactions are as follows.
CaC2 + 2 H2O --> Ca(OH)2 + C2H2
KI + NaOCl --> KCl + NaOI
2 NaOI + C2H2 --> 2 NaOH + C2I2
The yield of diiodoacetylene melting at 81°C from this procedure is about 88%. Losses are due to the instability of the hypoiodite which decomposes through the following equations:
3 NaOI --> 2 NaI + NaIO3
NaOI + 3 NaOCl + NaOH + H2O --> 3NaCl + H3Na2IO6

Post a RFQ

Enter 15 to 2000 letters.Word count: 0 letters

Attach files(File Format: Jpeg, Jpg, Gif, Png, PDF, PPT, Zip, Rar,Word or Excel Maximum File Size: 3MB)

1

What can I do for you?
Get Best Price

Get Best Price for 624-74-8
Related Products

Hot Products

Post a RFQ