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Radiochimica Acta

International Journal for chemical aspects of nuclear science and technology

Editor-in-Chief: Qaim, Syed M.

12 Issues per year

IMPACT FACTOR 2017: 1.202

CiteScore 2017: 1.22

SCImago Journal Rank (SJR) 2017: 0.409
Source Normalized Impact per Paper (SNIP) 2017: 0.869

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Volume 103, Issue 7


Uranyl tris-(carbohydrazide) nitrate [UO2((N2H3)2CO)3](NO3)2: synthesis, structure and properties

Darya Y. Leshok / Vladimir N. Alekseenko / Peter M. Gavrilov / Sergei N. Alekseenko / Anton S. Dyachenko / Alexander A. Samoilo / Alexander A. Kondrasenko / Sergei D. Kirik
Published Online: 2015-04-13 | DOI: https://doi.org/10.1515/ract-2014-2337


Uranyl tris-(carbohydrazide) nitrate [UO2((N2H3)2CO)3](NO3)2 was prepared by the reaction of water solution of dioxouranium(VI) nitrate UO2(NO3)2(H2O)6 with ethanol solution of carbohydrazide (N2H3)2CO in a molar ratio of 1 to 3 in an neutral medium. The substance was characterized by elemental, thermal analysis and IR and 15N MAS CP NMR spectroscopy. Ab initio crystal structure determination was carried out using X-ray powder diffraction techniques. The compound crystallizes in monoclinic lattice with unit cell parameters: a = 15.193(1) Å, b = 12.005(1) Å, c = 10.842(1) Å, β = 109.15(1), V = 1868.11 Å3, Z = 4, SG = Cc. The type of carbohydrazide coordination was additionally confirmed by 15N MAS CP NMR and IR spectroscopy. In the complex ion [UO2((N2H3)2CO)3]2+ three carbohydrazide ligands coordinate to UO22+ through oxygen and nitrogen forming three five-membered chelate rings. The carbohydrazide rings are tuned to the equatorial plane of complex. The crystal structure consists of zig-zag chains of [UO2((N2H3)2CO)3]2+ cations stretched along c-axis. The cations in the chain are linked by the hydrogen bonds between the cations themselves. The anions are located in the pores between chains and participate in hydrogen bonding between adjacent chains and additionally link the chain sections. The length of the chain section is 5.768 Å and the angle between sections is 140. The substance [UO2((N2H3)2CO)3](NO3)2 is thermally stable up to 215 ℃ and then decomposes with an explosion.

This article offers supplementary material which is provided at the end of the article.

Keywords: Uranium(VI) coordination compounds; carbohydrazide; X-ray crystal structure solution; IR- and 15N MAS CP NMR spectroscopy

Supplementary material

the online version of this article (DOI: 10.1515/ract-2014-2337) provides supplementary material for authorized users.

About the article

Accepted: 2015-01-15

Received: 2014-09-04

Published Online: 2015-04-13

Published in Print: 2015-07-28

Citation Information: Radiochimica Acta, Volume 103, Issue 7, Pages 477–486, ISSN (Online) 2193-3405, ISSN (Print) 0033-8230, DOI: https://doi.org/10.1515/ract-2014-2337.

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