Germanium(II) iodide Property

Melting point:

460°C

Boiling point:

545°C

Density 

5.37 g/mL at 25 °C(lit.)

storage temp. 

under inert gas (nitrogen or Argon) at 2–8 °C

solubility 

Soluble in dilute hydrochloric acid.

form 

orange-yellow hexagonal crystals

Specific Gravity

5.73

color 

Yellow to brown

Water Solubility 

soluble H2O [CRC10]

Sensitive 

Air & Moisture Sensitive

CAS DataBase Reference

13573-08-5(CAS DataBase Reference)

EPA Substance Registry System

Germanium iodide (GeI2) (13573-08-5)

Safety

Hazard Codes 

C

Risk Statements 

34

Safety Statements 

23-26-27-36/37/39-45

RIDADR 

UN 3260 8/PG 2

WGK Germany 

3

F 

10-19-21

TSCA 

Yes

HazardClass 

8

PackingGroup 

II

HS Code 

2827600090

Hazard and Precautionary Statements (GHS)

Symbol(GHS)

Signal word

Danger

Hazard statements

H314Causes severe skin burns and eye damage

Precautionary statements

P260Do not breathe dust/fume/gas/mist/vapours/spray.

P280Wear protective gloves/protective clothing/eye protection/face protection.

P303+P361+P353IF ON SKIN (or hair): Remove/Take off Immediately all contaminated clothing. Rinse SKIN with water/shower.

Germanium(II) iodide Chemical Properties,Usage,Production

Description

Germanium diiodide (also named as germanium (II) iodide) is a yellow crystalline solid which decomposes on melting. Its specific density is 5.37. It can be sublimed at 240°C in a vacuum.¹ It can be used to obtain high yield of germanium nanocrystals.²

References

1. https://en.wikipedia.org/wiki/Germanium_iodide 
2. X. Lu, B. A. Korgel, K. P. Johnston, High yield of germanium nanocrystals synthesized from germanium diiodide in solution, Chemistry of Materials, 2005, vol. 17, pp. 6479-6485

Chemical Properties

Germanium(II) iodide is a yellow to gold flake or powder. It can dissolve in cold water, concentrated hydriodic acid, and dilute acid. It has limited solubility in chloroform and carbon tetrachloride, while it does not dissolve in carbon disulfide. It decomposes in hot water and reacts with an ammonia solution to form imine germanium. Under vacuum, it sublimates at 240°C. It remains stable in dry air but undergoes hydrolysis in moist air.

Uses

Germanium(II) iodide acts as a reagent that forms stable ionic adducts with carbenes. It is also used in the preparation of allylgermanes by reacting with allylstannanes. Further, it reacts with allyl bromide in the presence of zinc iodide to get allylgermanium(IV), which on reacts with carbonyl compounds to give the corresponding homoallylic alcohols.

Preparation

From a germanium sulfide powder by adding excess 57% concentrated hydriodic acid, under stirring at 100 ℃ for the reaction, filtered while hot, the filtrate is slowly cooled system. It can also be made by adding germanium tetraiodide to distilled water and 57% concentrated hydriodic acid with stirring, adding 50% hypophosphite, boiling under reflux, crystallizing after reaction, washing with dilute hydriodic acid and drying.