Berkelium(III) nitrate

Berkelium(III) nitrate is the berkelium salt of nitric acid with the formula Bk(NO3)3. It commonly forms the tetrahydrate, Bk(NO3)3·4H2O, which is a light green solid. If heated to 450 °C, it decomposes to berkelium(IV) oxide and 22 milligrams of the solution of this compound is reported to cost one million dollars.

Berkelium(III) nitrate

A 22 milligram solution of berkelium(III) nitrate, photographed c. 2009/10
Names
Other names
  • Berkelium trinitrate
Identifiers
3D model (JSmol)
  • [N+](=O)([O-])[O-].[N+](=O)([O-])[O-].[N+](=O)([O-])[O-].[Bk+3]
Properties
Bk(NO3)3
Molar mass 433.01 g/mol
Appearance Light-green solid[1]
Melting point 450 °C (842 °F; 723 K)[1] decomposes
Solubility Soluble in nitric acid
Hazards
Occupational safety and health (OHS/OSH):
Main hazards
 Radioactive
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references

Production and uses

Berkelium(III) nitrate is produced by the reaction of berkelium metal, the hydroxide,[1] or chloride[2] with nitric acid.[1] This compound has no commercial uses, but was used to synthesize the element tennessine. The aqueous compound was painted onto a titanium foil and was bombarded with calcium-48 atoms to synthesize the element tennessine.[3]

This compound is used as a pathway to pentavalent berkelium compounds by the collision-induced dissociation of this compound do produce BkO2(NO3)2– which contains berkelium in the +5 oxidation state.[2]

References
  1. Haire, R. G., Proc. Rare Earth Res. Conf., loth, Carefree, Arizona, April-May, p. 882 (1973) doi:10.2172/4549027
  2. Attila Kovács; Phuong D. Dau; Joaquim Marçalo; John K. Gibson (2018). "Pentavalent Curium, Berkelium, and Californium in Nitrate Complexes: Extending Actinide Chemistry and Oxidation States". Inorganic Chemistry. ACS Publications. 57 (15): 9453–9467. doi:10.1021/acs.inorgchem.8b01450. OSTI 1631597. PMID 30040397. S2CID 51717837.
  3. J. B. Roberto; K. P. Rykaczewski (2016). "Discovery of element 117: Super-heavy elements and the "island of stability"". Separation Science and Technology. 53 (12): 1813–1819. doi:10.1080/01496395.2017.1290658. OSTI 1408011. S2CID 99111297.
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