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Crystals 2018, 8(12), 462; https://doi.org/10.3390/cryst8120462

Complex Uranyl Dichromates Templated by Aza-Crowns

1
Department of Crystallography, St. Petersburg State University, University Emb. 7/9, 199034 St. Petersburg, Russia
2
Nanomaterials Research Center, Kola Science Center, Russian Academy of Sciences, Apatity, 184200 Murmansk Region, Russia
3
Department of Chemistry, Moscow State University, Leninskie Gory 1, 119991 Moscow, Russia
*
Author to whom correspondence should be addressed.
Received: 3 November 2018 / Revised: 28 November 2018 / Accepted: 7 December 2018 / Published: 10 December 2018
(This article belongs to the Section Crystalline Materials)
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Abstract

Three new uranyl dichromate compounds templated by aza-crown templates were obtained at room temperature by evaporation from aqueous solutions: (H2diaza-18-crown-6)2[(UO2)2(Cr2O7)4(H2O)2](H2O)3 (1), (H4[15]aneN4)[(UO2)2(CrO4)2(Cr2O7)2(H2O)] (H2O)3.5 (2) and (H4Cyclam)(H4[15]aneN4)2[(UO2)6(CrO4)8(Cr2O7)4](H2O)4 (3). The use of aza-crown templates made it possible to isolate unprecedented and complex one-dimensional units in 2 and 3, whereas the structure of 1 is based on simple uranyl-dichromate chains. It is very likely that the presence of relatively large organic molecules of aza-crown ethers does not allow uranyl chromate chain complexes to condense into the units of higher dimensionality (layers or frameworks). In general, the formation of 1, 2, and 3 is in agreement with the general principles elaborated for organically templated uranyl compounds. The negative charge of the [(UO2)(Cr2O7)2(H2O)]2−, [(UO2)2(CrO4)2(Cr2O7)2(H2O)]4− and [(UO2)3(CrO4)4(Cr2O7)2]6− one-dimensional inorganic motifs is compensated by the protonation of all nitrogen atoms in the molecules of aza-crowns. View Full-Text
Keywords: uranium; chromium; dichromates; aza-crowns; organically templated uranyl compounds uranium; chromium; dichromates; aza-crowns; organically templated uranyl compounds
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Siidra, O.I.; Nazarchuk, E.V.; Charkin, D.O.; Kalmykov, S.N.; Zadoya, A.I. Complex Uranyl Dichromates Templated by Aza-Crowns. Crystals 2018, 8, 462.

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