Neptunocene

Neptunocene
Names
	IUPAC name Bis(η8-cyclooctatetraenyl)neptunium(IV)
	Other names Neptunium cyclooctatetraenide; Np(COT)2
Identifiers
CAS Number	154974-81-9 ;
3D model (JSmol)	Interactive image;
	InChI InChI=1S/2C5H5.Np/c21-2-4-5-3-1;/h21-5H;/q2*-1;+2 Key: FXDJOXAJBKYPFW-UHFFFAOYSA-N;
	SMILES [Np].C1=CC=CC=CC=C1.C1=CC=CC=CC=C1;
Properties
Chemical formula	C16H16Np
Molar mass	445 g·mol−1
Appearance	dark brown crystals as a solid, yellow in dilute solution
Solubility in water	insoluble, does not react with water
Solubility in chlorocarbons	sparingly soluble (ca. 0.5 g/L)
Hazards
	Occupational safety and health (OHS/OSH):
Main hazards	radiation hazard, pyrophoric
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

Neptunocene, Np(C₈H₈)₂, is an organoneptunium compound composed of a neptunium atom sandwiched between two cyclooctatetraenide (COT^2-) rings. As a solid it has a dark brown/red colour but it appears yellow when dissolved in chlorocarbons, in which it is sparingly soluble. The compound is quite air-sensitive.

It was one of the first organoneptunium compounds to be synthesised, and is a member of the actinocene family of actinide-based metallocenes.

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