1,2-Diiodoethane

1,2-Diiodoethane is an organoiodine compound.^[1]

1,2-Diiodoethane

Skeletal formula of 1,2-diiodoethane Stick and Balls model of 1,2-diiodoethane
Tube model of 1,2-diiodoethane Space Filling model of 1,2-diiodoethane
Names
Preferred IUPAC name 1,2-Diiodoethane
Other names Ethylene iodide
Identifiers
CAS Number	624-73-7 Y
3D model (JSmol)	Interactive image
ChemSpider	11723
ECHA InfoCard	100.009.872
PubChem CID	12224
UNII	9YH8PPH966 Y
CompTox Dashboard (EPA)	DTXSID8060791
InChI InChI=1S/C2H4I2/c3-1-2-4/h1-2H2 Key: GBBZLMLLFVFKJM-UHFFFAOYSA-N InChI=1/C2H4I2/c3-1-2-4/h1-2H2 Key: GBBZLMLLFVFKJM-UHFFFAOYAR
SMILES ICCI
Properties
Chemical formula	C2H4I2
Molar mass	281.863 g·mol−1
Density	2.13 g/cm3
Melting point	80 to 82 °C (176 to 180 °F; 353 to 355 K)
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

Preparation and reactions

1,2-Diiodoethane can be prepared by the reaction of ethylene with iodine (I₂):^[2]

C₂H₄ + I₂ ⇌ C₂H₄I₂

1,2-Diiodoethane is most commonly used in organic synthesis in the preparation of samarium(II) iodide or ytterbium(II) iodide in an inert solvent such as THF.^[3]

Sm + ICH₂CH₂I → SmI₂ + H₂C=CH₂

Spectral properties

In mass spectroscopy, 1,2-diiodoethane exhibits 5 major peaks, with the base peak showing at 155 m/z, which is the loss of one iodine atom (127 m/z).