Organically Templated Layered Uranyl Molybdate [C3H9NH+]4[(UO2)3(MoO4)5] Structurally Based on Mineral-Related Modular Units

Evgeny Nazarchuk,Oleg Siidra,Dmitri Charkin,Stepan Kalmykov

doi:10.3390/min10080659

Evgeny Nazarchuk, Oleg Siidra + Show 2 more

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https://doi.org/10.3390/min10080659

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Abstract

A new organically templated uranyl molybdate [C3H9NH+]4[(UO2)3(MoO4)5] was prepared by a hydrothermal method at 220 °C. The compound is monoclinic, Сс, a = 16.768(6), b = 20.553(8), c = 11.897(4) Å, β = 108.195(7), V = 3895(2) Å3, R1 = 0.05. The crystal structure is based upon [(UO2)3(MoO4)5]4− uranyl molybdate layers. The isopropylammonium cations are located in the interlayer. The layers in the structure of [C3H9NH+]4[(UO2)3(MoO4)5] are considered as modular architectures. Topological analysis of layers with UO2:TO4 ratio of 3:5 (TVI = S, Cr, Se, Mo) was performed. Modular description is employed to elucidate the relationships between different structural topologies of [(UO2)3(TO4)5]4− layers and inorganic uranyl-based nanotubules. The possible existence of uranyl molybdate nanotubules is discussed.

Highlights

Investigations of natural and synthetic compounds of hexavalent uranium are important both for materials science and mineralogy
In the last two decades, particular attention has been paid to the hexavalent uranium compounds containing organic moieties, which are important for lanthanide/actinide separation
We report the synthesis and structure of new uranyl molybdate

Summary

Introduction

Investigations of natural and synthetic compounds of hexavalent uranium are important both for materials science and mineralogy. The development of the nuclear industry requires further investigations in the area of safe nuclear waste management [3]. The latter requires proper understanding of phase formation processes, relationships between chemical compositions, crystal structures, and properties of the compounds formed. Of particular interest are both the chemical nature of the possible secondary phases and their interactions with the geological environment [4]. In the last two decades, particular attention has been paid to the hexavalent uranium (uranyl) compounds containing organic moieties, which are important for lanthanide/actinide separation

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