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Journal of Chemical Crystallography

, Volume 34, Issue 11, pp 807–811 | Cite as

Synthesis and structure of ditetrabutylammonium tetrachlorodioxoneptunium(VI)

  • Marianne P. Wilkerson
  • Harry J. Dewey
  • Pamela L. Gordon
  • Brian L. Scott
Article

Abstract

The reaction of a stock solution of NpO22 + in 2 M HCl with two equivalents of tetrabutylammonium chloride in 6 M HCl results in the preparation of the title compound. This compound, [NBu4]2[NpO2Cl4], is isostructural with the uranium analogue, [NBu4]2[UO2Cl4]. The anion of the complex, [NpO2Cl4]2−, adopts a pseudooctahedral geometry common to six-coordinate actinyl complexes in which the neptunium metal is coordinated by two trans axial oxo groups with Np―O(oxo) bond lengths of 1.733(5)Å, and four equatorial chloride ligands with Np–Cl bond lengths in the range 2.637(2)–2.676(2)Å. The neptunyl O―Np―O bond angle is 178.6(3)°. Charge balance of the neptunyl tetrachloride anion is maintained by two tetrabutylammonium cations. This complex crystallizes in the monoclinic space group P21/n (a = 15.416(4), b = 15.362(4), c = 18.479(5)Å, β = 108.147(6)°, V = 4158.4(19)Å3, Z = 4).

Crystal structure neptunium neptunyl tetrachloride 

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Copyright information

© Springer Science+Business Media, Inc. 2004

Authors and Affiliations

  • Marianne P. Wilkerson
    • 1
  • Harry J. Dewey
    • 1
  • Pamela L. Gordon
    • 1
  • Brian L. Scott
    • 1
  1. 1.Los Alamos National LaboratoryChemistry DivisionLos AlamosUSA

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