Synonym:  Bis(cyclopentadienyl)cobalt(II), C10H10Co, Co(C5H5)2

CAS Number 1277-43-6 | EC Number 215-061-0 | MDL Number MFCD00013749

Bis(cyclopentadienyl)cobalt Chemical Structure
Product codeCO7436
CAS #1277-43-6
Assay (purity)98.5%+
Purity methodby elemental analysis:%C=62.6-64.5; %H=5.3-5.4
Molecular weight189.12
Appearanceblack powder or crystals
Melting point176-180 °C (dec.) (lit.)
Molecular formulaC10H10Co
Linear formulaCo(C5H5)2


Bis(cyclopentadienyl)cobalt is manufactured and sold in small and bulk volumes. Glass ampules, bottles or metal ampules or bubblers are available for packaging. Additional technical, research and safety (SDS) information is available. For additional analytical information or details about purchasing Bis(cyclopentadienyl)cobalt contact us at

Safety Information

Hazardous class4.1
Packing groupIII
Pictograms GHS08 GHS02
Signal worddanger
Hazard statementsH228 – H334 – H317 – H341 – H351
Precautionary statementsP201 – P202 – P280 – P284 – P210 – P261 – P272 (OSHA) –  P308 + P313 – P304 + P341 (OSHA) – P342 + P311 – P302 + P352 + P363 – P333 + P313 – P405 – P501
Transport descriptionFLAMMABLE SOLID, ORGANIC, N.O.S. (Cobaltocene)
In TSCA registryNo (sold for research and development usage only)

First Aid Measures

General adviceConsult a physician. Show this safety data sheet to the doctor in attendance.Move out of dangerous area.
Eye contactRinse thoroughly with plenty of water for at least 15 minutes and consult a physician.
Skin contactWash off with soap and plenty of water. Consult a physician.
InhalationIf breathed in, move person into fresh air. If not breathing, give artificial respiration. Consult a physician.
If swallowedDo NOT induce vomiting. Never give anything by mouth to an unconscious person. Rinse mouth with water. Consult a physician.

Certificates of analysis (CoA)

If you don’t see the needed lot of Bis(cyclopentadienyl)cobalt below please contact customer support at

Lot# 032/089 Lot# 031/370Lot# 031/315Lot# 029/206

External identifiers for Bis(cyclopentadienyl)cobalt

Pubchem CID22045960
IUPAC NameCobaltoceneBis(η5-cyclopentadienyl)cobalt
InchI IdentifierInChI=1S/2C5H5.Co/c2*1-2-4-5-3-1;/h2*1-5H;/q2*-1;+2

Known applications and external links

  • King, R. B. (1965). Organometallic Syntheses. 1. New York, NY: Academic Press.
  • Antipin, M. Yu.; Boese, R.; Augart, N.; Schmid, G. (1993). “Redetermination of the cobaltocene crystal structure at 100 K and 297 K: Comparison with ferrocene and nickelocene”. Struct. Chem. 4 (2): 91–101  doi:10.1007/BF00677370.
  • Elschenbroich, C.; Salzer, A. (1992). Organometallics: A Concise Introduction (2nd ed.). Weinheim: Wiley-VCH. ISBN 978-3-527-28165-7

With Bis(cyclopentadienyl)cobalt other customers often ask:

Ereztech synthesizes and sells additional Co-compounds.

To purchase Bis(cyclopentadienyl)cobalt contact us at