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Radiochemistry

, Volume 60, Issue 5, pp 521–526 | Cite as

Synthesis and Structure of the Np(VII) Complex with Guanidinium, Li[C(NH2)3]2[NpO4(OH)2]·6H2O

  • I. A. CharushnikovaEmail author
  • N. N. Krot
  • V. P. Perminov
Article
  • 8 Downloads

Abstract

The previously unknown Np(VII) compound Li[C(NH2)3]2[NpO4(OH)2]·6H2O (I), containing organic cations, was synthesized and studied by single crystal X-ray diffraction. In contrast to the relatively numerous structurally characterized salts of [NpO4(OH)2]3– anions with Na+, K+, Rb+, and Cs+ cations, which were prepared only from strongly alkaline media, crystals of I were isolated from solutions with a very low concentration of OH ions (about 0.1 M). The compound is relatively stable in storage in the dry form, but is strongly hygroscopic. In the structure of I, there are two independent Np(VII) atoms with the oxygen surrounding in the form of tetragonal bipyramids. In contrast to the other salts of the [NpO4(OH)2]3– anions with singlecharged alkali metal cations, the C(NH2) 3 + ions and hydrated Li+ ions in I interact with the oxygen surrounding of Np(VII) only via hydrogen bonds of types Ow–H···O and N–H···O with the formation of a three-dimensional H-bond network.

Keywords

neptunium(VII) guanidinium synthesis crystal structure 

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Copyright information

© Pleiades Publishing, Inc. 2018

Authors and Affiliations

  • I. A. Charushnikova
    • 1
    Email author
  • N. N. Krot
    • 1
  • V. P. Perminov
    • 1
  1. 1.Frumkin Institute of Physical Chemistry and ElectrochemistryRussian Academy of SciencesMoscowRussia

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