Cobaltocene

Cobaltocene

Names
IUPAC names Cobaltocene Bis(η5-cyclopentadienyl)cobalt
Other names Cp2Co
Identifiers
CAS Number	1277-43-6 Y
3D model (JSmol)	Interactive image
ChEBI	CHEBI:30678 N
ChemSpider	83848 Y
ECHA InfoCard	100.013.692
EC Number	215-061-0
PubChem CID	22045960
RTECS number	GG0350000
UNII	4W7LGU89CV Y
CompTox Dashboard (EPA)	DTXSID0024840
InChI InChI=1S/2C5H5.Co/c2*1-2-4-5-3-1;/h2*1-5H;/q2*-1;+2 Y Key: ILZSSCVGGYJLOG-UHFFFAOYSA-N Y InChI=1/2C5H5.Co/c2*1-2-4-5-3-1;/h2*1-5H;/q2*-1;+2 Key: ILZSSCVGGYJLOG-UHFFFAOYAM
SMILES [cH-]1cccc1.[cH-]1cccc1.[Co+2]
Properties
Chemical formula	[Co(η5-C5H5)2]
Molar mass	189.12 g/mol
Appearance	Dark purple solid
Melting point	171–173 °C (340–343 °F; 444–446 K)
Solubility in water	Insoluble
Structure
Coordination geometry	sandwich
Dipole moment	zero
Thermochemistry
Std molar entropy (S⦵298)	236 J K−1 mol−1
Std enthalpy of formation (ΔfH⦵298)	+237 kJ/mol (uncertain)
Std enthalpy of combustion (ΔcH⦵298)	−5839 kJ/mol
Hazards
GHS labelling:
Pictograms	[1]
Signal word	Danger[1]
Hazard statements	H228, H317, H351[1]
Precautionary statements	P210, P261, P280, P363, P405, P501[1]
NFPA 704 (fire diamond)	1 2 0
Safety data sheet (SDS)	External SDS
Related compounds
Related metallocenes	Ferrocene Nickelocene Rhodocene
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). N verify (what is YN ?) Infobox references

Cobaltocene, known also as bis(cyclopentadienyl)cobalt(II) or even "bis Cp cobalt", is an organocobalt compound with the formula Co(C₅H₅)₂. It is a dark purple solid that sublimes readily slightly above room temperature. Cobaltocene was discovered shortly after ferrocene, the first metallocene. Due to the ease with which it reacts with oxygen, the compound must be handled and stored using air-free techniques.