Berkelium(III) chloride

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Berkelium(III) chloride
Names
Other names
  • Berkelium trichloride
Identifiers
3D model (
JSmol
)
  • InChI=1S/Bk.3ClH/h;3*1H/p-3
    Key: IZRUUNBZXOYLEH-UHFFFAOYSA-K
  • [Cl-].[Cl-].[Cl-].[Bk+3]
Properties
BkCl3
Molar mass 353.36 g/mol
Appearance Green solid
Melting point 603 °C (1,117 °F; 876 K)[1]
Soluble
Structure
Hexagonal
P63/m
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).

Berkelium(III) chloride also known as berkelium trichloride, is a chemical compound with the formula BkCl3. It is a water-soluble green salt with a melting point of 603 °C. This compound forms the hexahydrate, BkCl3·6H2O.

Preparation and reactions

This compound was first prepared in 1970 by reacting hydrogen chloride gas and berkelium(IV) oxide or berkelium(III) oxide at 520 °C:[2]

Bk2O3 + 6HCl → 2BkCl3 + 3H2O

Berkelium(III) chloride reacts with beryllocene to produce berkelocene(Bk(C5H5)3).[3] It also reacts with oxalic acid to produce berkelium oxalate. This reaction is used to purify this compound, by reacting the oxalate with hydrochloric acid.[4]

Structure

Anhydrous berkelium(III) chloride has a hexagonal crystal structure, is isostructural to

uranium trichloride, and has the person symbol hP6. When heated it its melting point, it converts to an orthorhombic phase.[2] However, the hexahydrate has a monoclinic crystal structure and is isostructural to americium trichloride hexahydrate with the lattice constants a = 966 pm, b = 654 pm and c = 797 pm.[5]
This hexahydrate consists of BkCl2(OH2)6+ ions and Cl− ions.

Complexes

Caesium sodium berkelium chloride is known with the formula Cs2NaBkCl6 and is produced by the reaction of berkelium(III) hydroxide, hydrochloric acid, and caesium chloride.[6]

References

  1. ISBN 978-3-11-017770-1
  2. ^
    doi:10.1016/S0898-8838(08)60204-4
    .
  3. doi:10.1021/ic50087a018
    .
  4. doi:10.1021/ic00241a015
    .
  5. doi:10.1021/ic50095a029
    .
  6. doi:10.1016/S0898-8838(08)60204-4
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