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Neptunocene

Names
IUPAC name Bis(η-cyclooctatetraenyl)neptunium(IV)
Other names Neptunium cyclooctatetraenide Np(COT)2
Identifiers
3D model (JSmol)	Interactive image
SMILES .C1=CC=CC=CC=C1.C1=CC=CC=CC=C1
Properties
Chemical formula	C16H16Np
Molar mass	445 g·mol
Hazards
Occupational safety and health (OHS/OSH):
Main hazards	Ignites in air
Except where otherwise noted, data are given for materials in their standard state (at 25 °C , 100 kPa). Infobox references

Neptunocene, Np(C₈H₈)₂, is an organoneptunium compound composed of a neptunium atom sandwiched between two cyclooctatetraenide rings. It was one of the first organoneptunium compounds to be synthesized. Neptunocene, a member of the "actinocenes," a group of metallocenes incorporating elements from the actinide series.

Property and synthesis

It was synthesized in 1970 by reacting neptunium(IV) chloride with dipotassium cyclooctatetraenide (K₂(C₈H₈). It is isomorphous to uranocene and plutonocene, and they behave chemically identically. All three compounds are insensitive to water or dilute bases, but are sensitive to air, reacting quickly to form oxides, and are only slightly soluble in benzene and toluene.

References

1. Yoshida, Zenko; Johnson, Stephen G.; Kimura, Takaumi; Krsul, John R. (2006). "Neptunium". In Morss, Lester R.; Edelstein, Norman M.; Fuger, Jean (eds.). The Chemistry of the Actinide and Transactinide Elements (PDF). Vol. 3 (3rd ed.). Dordrecht, the Netherlands: Springer. pp. 699–812. doi:10.1007/1-4020-3598-5_6.

• Neptunium compounds
• Organoactinide compounds
• Metallocenes