Complex Uranyl Dichromates Templated by Aza-Crowns
AbstractThree 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), (H4aneN4)[(UO2)2(CrO4)2(Cr2O7)2(H2O)] (H2O)3.5 (2) and (H4Cyclam)(H4aneN4)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
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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.
Siidra OI, Nazarchuk EV, Charkin DO, Kalmykov SN, Zadoya AI. Complex Uranyl Dichromates Templated by Aza-Crowns. Crystals. 2018; 8(12):462.Chicago/Turabian Style
Siidra, Oleg I.; Nazarchuk, Evgeny V.; Charkin, Dmitry O.; Kalmykov, Stepan N.; Zadoya, Anastasiya I. 2018. "Complex Uranyl Dichromates Templated by Aza-Crowns." Crystals 8, no. 12: 462.
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