Chromocene Property

Melting point:

168-170 °C(lit.)

storage temp. 

Store below +30°C.

form 

crystal

color 

scarlet

Water Solubility 

Insoluble in water.

Sensitive 

Air & Moisture Sensitive

NIST Chemistry Reference

Bis(«eta»5-cyclopentadienyl) chromium(1271-24-5)

EPA Substance Registry System

Chromocene (1271-24-5)

Safety

Hazard Codes 

Xn,Xi

Risk Statements 

20/21/22-36/37/38

Safety Statements 

26-37/39

RIDADR 

1325

WGK Germany 

3

RTECS 

GB7600000

TSCA 

Yes

HazardClass 

4.2

PackingGroup 

I

HS Code 

29319090

Hazard and Precautionary Statements (GHS)

Symbol(GHS)

Signal word

Danger

Hazard statements

H314Causes severe skin burns and eye damage

H317May cause an allergic skin reaction

Precautionary statements

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

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

P301+P312IF SWALLOWED: call a POISON CENTER or doctor/physician IF you feel unwell.

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

P305+P351+P338IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continuerinsing.

Chromocene Chemical Properties,Usage,Production

Chemical Properties

bordeaux crystalline powder

Uses

Provides catalyst for ethylene polymerization. A precursor to other chromium(II) compounds.

General Description

Red needles or reddish-purple solid.

Air & Water Reactions

Chromocene is very sensitive to exposure to air and moisture (decomposition is not vigorous). Decomposes in water .

Reactivity Profile

Chromocene reacts with water and alcohols. . It's reaction with alcohols produces pyrophoric metal alkoxides (dialkoxychromium and cyclopentadiene).

Fire Hazard

Literature sources indicate that Chromocene is flammable.

Purification Methods

Chromocene forms pyrophoric red crystals on sublimation at 50o/0.1mm followed by resublimation at 75-90o/0.1mm. Although it is stable at least to 300o, it is readily oxidised in air, and effervesces slowly in H2O to give cyclopentadiene. All operations should be carried out in a dry box. It decomposes in CCl4 or CS2, and for IR even grinding with nujol, KBr or KI causes some decomposition. [Wilkinson et al. J Inorg Nucl Chem 95 109 1956, Wilkinson J Am Chem Soc 76 209 1954, Beilstein 16 IV 1774.]