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Effect of solution acidity on the crystallization of polychromates in uranyl-bearing systems: synthesis and crystal structures of Rb2[(UO2)(Cr2O7)(NO3)2] and two new polymorphs of Rb2Cr3O10

  • Evgeny V. Nazarchuk , Oleg I. Siidra EMAIL logo , Dmitry O. Charkin , Stepan N. Kalmykov and Elena L. Kotova
Published/Copyright: January 26, 2021
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Zeitschrift für Kristallographie - Crystalline Materials
From the journal Zeitschrift für Kristallographie - Crystalline Materials Volume 236 Issue 1-2

Abstract

Three new rubidium polychromates, Rb2[(UO2)(Cr2O7)(NO3)2] (1), γ-Rb2Cr3O10 (2) and δ-Rb2Cr3O10 (3) were prepared by combination of hydrothermal treatment at 220 °C and evaporation of aqueous solutions under ambient conditions. Compound 1 is monoclinic, P21/c, a = 13.6542(19), b = 19.698(3), c = 11.6984(17) Å, β = 114.326(2)°, V = 2867.0(7) Å3, R1 = 0.040; 2 is hexagonal, P63/m, a = 11.991(2), c = 12.828(3) Å, γ = 120°, V = 1597.3(5) Å3, R1 = 0.031; 3 is monoclinic, P21/n, a = 7.446(3), b = 18.194(6), c = 7.848(3) Å, β = 99.953(9)°, V = 1047.3(7) Å3, R1 = 0.037. In the crystal structure of 1, UO8 bipyramids and NO3 groups share edges to form [(UO2)(NO3)2] species which share common corners with dichromate Cr2O7 groups producing novel type of uranyl dichromate chains [(UO2)(Cr2O7)(NO3)2]2−. In the structures of new Rb2Cr3O10 polymorphs, CrO4 tetrahedra share vertices to form Cr3O102− species. The trichromate groups are aligned along the 63 screw axis forming channels running in the ab plane in the structure of 2. The Rb cations reside between the channels and in their centers completing the structure. The trichromate anions are linked by the Rb+ cations into a 3D framework in the structure of 3. Effect of solution acidity on the crystallization of polychromates in uranyl-bearing systems is discussed.

Keywords: hexavalent chromium; polychromates; rubidium; uranium
Corresponding author: Oleg I. Siidra, Department of Crystallography, St. Petersburg State University, University Emb. 7/9, 199034St. Petersburg, Russia; and Kola Science Center, Russian Academy of Sciences, Apatity, 184200Murmansk Region, Russia, E-mail:

Funding source: Russian Science Foundation

Award Identifier / Grant number: 16-17-10085

Acknowledgments

Technical support by the SPbSU X-ray Diffraction and Microscopy and Microanalysis Resource Centers is gratefully acknowledged.

  1. Author contributions: All the authors have accepted responsibility for the entire content of this submitted manuscript and approved submission.

  2. Research funding: This work was financially supported by the Russian Science Foundation through the grant 16-17-10085.

  3. Conflict of interest statement: The authors declare no conflicts of interest regarding this article.

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Supplementary Material

The online version of this article offers supplementary material (https://doi.org/10.1515/zkri-2020-0078).

Received: 2020-09-03
Accepted: 2021-01-15
Published Online: 2021-01-26
Published in Print: 2021-02-23

© 2021 Walter de Gruyter GmbH, Berlin/Boston

Articles in the same Issue

  1. Frontmatter
  2. In this issue
  3. Original papers
  4. Phase stability analysis of shocked ammonium dihydrogen phosphate by X-ray and Raman scattering studies
  5. Effect of solution acidity on the crystallization of polychromates in uranyl-bearing systems: synthesis and crystal structures of Rb2[(UO2)(Cr2O7)(NO3)2] and two new polymorphs of Rb2Cr3O10
  6. Novel tetrazole PtII and PdII complexes with enhanced water solubility: synthesis, structural characterization and evaluation of antiproliferative activity
  7. Hydrogen-bonding in mono-, di- and tetramethylammonium dihydrogenphosphites
  8. Photophysical property change of N-(5-bromo-salicylidene)-3-aminoethylpyridine monohydrated crystals via dehydration phase transition
https://doi.org/10.1515/zkri-2020-0078
Keywords for this article
hexavalent chromium; polychromates; rubidium; uranium

Articles in the same Issue

  1. Frontmatter
  2. In this issue
  3. Original papers
  4. Phase stability analysis of shocked ammonium dihydrogen phosphate by X-ray and Raman scattering studies
  5. Effect of solution acidity on the crystallization of polychromates in uranyl-bearing systems: synthesis and crystal structures of Rb2[(UO2)(Cr2O7)(NO3)2] and two new polymorphs of Rb2Cr3O10
  6. Novel tetrazole PtII and PdII complexes with enhanced water solubility: synthesis, structural characterization and evaluation of antiproliferative activity
  7. Hydrogen-bonding in mono-, di- and tetramethylammonium dihydrogenphosphites
  8. Photophysical property change of N-(5-bromo-salicylidene)-3-aminoethylpyridine monohydrated crystals via dehydration phase transition
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