Neptunocene

Neptunocene
Names
IUPAC name
Bis(η8-cyclooctatetraene)neptunium
Other names
Neptunium cyclooctatetraenide
Np(COT)2
Identifiers
3D model (JSmol)
  • InChI=1S/2C5H5.Np/c2*1-2-4-5-3-1;/h2*1-5H;/q2*-1;+2
    Key: FXDJOXAJBKYPFW-UHFFFAOYSA-N
  • c1=c[cH-]c=c[cH-]c=c1.[Np+4].c1=c[cH-]c=c[cH-]c=c1
Properties
C16H16Np
Molar mass 445 g·mol−1
Appearance dark brown crystals as a solid, yellow in dilute solution
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 (COT2-) 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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