Nickelocene

Nickelocene
	Nickelocene freshly depositied on a cold finger
Names
	Preferred IUPAC name Nickelocene
	Other names Bis(cyclopentadienyl) nickel(II)
Identifiers
CAS Number	1271-28-9 ;
3D model (JSmol)	Interactive image;
ChEBI	CHEBI:30679 ;
ChemSpider	56178;
ECHA InfoCard	100.013.672
EC Number	215-039-0;
Gmelin Reference	3412
PubChem CID	13628993;
RTECS number	QR6500000;
UNII	JR8F745XV5 ;
UN number	1325 3082
CompTox Dashboard (EPA)	DTXSID8025709 ;
	InChI InChI=1S/2C5H5.Ni/c21-2-4-5-3-1;/h21-5H;/q2*-1;+2 Key: KZPXREABEBSAQM-UHFFFAOYSA-N;
	SMILES C1=C[CH-](C=C1).[Ni+2].[CH-](C=C2)C=C2;
Properties
Chemical formula	C10H10Ni
Molar mass	188.88 g/mol
Appearance	Green crystals
Density	1.47 g/cm3
Melting point	171 to 173 °C (340 to 343 °F; 444 to 446 K)
Solubility in water	insoluble
Structure
Coordination geometry	D5h, D5d
Dipole moment	0 D
Hazards
	GHS labelling:
Pictograms
Signal word	Danger
Hazard statements	H228, H302, H317, H350
Precautionary statements	P201, P202, P210, P240, P241, P261, P264, P270, P272, P280, P281, P301+P312, P302+P352, P308+P313, P321, P330, P333+P313, P363, P370+P378, P405, P501
NFPA 704 (fire diamond)	2 4 2
	Lethal dose or concentration (LD, LC):
LD50 (median dose)	490 mg kg−1 (oral, rat) ; 600 mg kg−1 (oral, mouse)
Related compounds
Related compounds	CoCp2, FeCp2
	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

Nickelocene is the organonickel compound with the formula Ni(η⁵-C₅H₅)₂. Also known as bis(cyclopentadienyl)nickel or NiCp₂, this bright green paramagnetic solid is of enduring academic interest, although it does not yet have any known practical applications.