Cobaltocene

Cobaltocene
Names
	IUPAC names Cobaltocene; Bis(η5-cyclopentadienyl)cobalt
	Other names Cp2Co
Identifiers
CAS Number	1277-43-6 ;
3D model (JSmol)	Interactive image;
ChEBI	CHEBI:30678 ;
ChemSpider	83848 ;
ECHA InfoCard	100.013.692
EC Number	215-061-0;
PubChem CID	22045960;
RTECS number	GG0350000;
UNII	4W7LGU89CV ;
CompTox Dashboard (EPA)	DTXSID0024840 ;
	InChI InChI=1S/2C5H5.Co/c21-2-4-5-3-1;/h21-5H;/q2-1;+2 Key: ILZSSCVGGYJLOG-UHFFFAOYSA-N ; InChI=1/2C5H5.Co/c21-2-4-5-3-1;/h21-5H;/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
Signal word	Danger
Hazard statements	H228, H317, H351
Precautionary statements	P210, P261, P280, P363, P405, P501
NFPA 704 (fire diamond)	1 2 0
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). verify (what is ?) 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.