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Molybdate Complexes of Neptunium(V) with Cations K+, NH4+, Rb+, and Tl+ in Outer Sphere

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Abstract

We have synthesized and structurally characterized molybdate complexes of neptunium(V) with singly charged cations in the outer sphere and the ratio NpO2+ : MoO42– = 1 : 1 of the common composition M[(NpO2)(MoO4)(H2O)] (I), where M+ = NH4+ (Ia), Rb+ (Ib) and Tl+ (Ic), and a new complex with the ratio NpO2+ : MoO42– = 1 : 2 of the composition K6[(NpO2)(MoO4)2(H2O)2]2 (II). In isostructural compounds I, the coordination environment of Np atoms is pentagonal bipyramids linked by tetradentate-bridging MoO42– ions into an anionic framework. The main structural motive of compound II is centrosymmetric dimeric anions, in which pentagonal bipyramids are linked by bidentate bridging MoO42– ions.

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Funding

The study was in part financed by the Ministry of Science and Higher Edication of the Russian Federation (topic no. AAAA-A18-118040590105-4) and by the program 35 of the Presidium of the Russian Academy of Sciences “Scientific foundations of the development of new functional materials.” X-ray diffraction experiments were performed at the Center for Collective Use of Physical Methods of Investigation of the Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences.

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Correspondence to I. A. Charushnikova.

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Translated from Radiokhimiya, No. 5, pp. 431–439, April, 2021 https://doi.org/10.31857/S0033831121050026

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Grigor’ev, M.S., Charushnikova, I.A. & Fedoseev, A.M. Molybdate Complexes of Neptunium(V) with Cations K+, NH4+, Rb+, and Tl+ in Outer Sphere. Radiochemistry 63, 556–564 (2021). https://doi.org/10.1134/S1066362221050027

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