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STRUCTURAL REGULARITIES OF MIXED HEPTAANIONS IN STRUCTURES Na2[Pd(NH3)4]5(Mo7–xWxO24)2·nH2O AND Na[Pd(NH3)4]2(HMo3.75W3.25O24)·7H2O

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Abstract

The main structural regularities of mixed heptapolyanions (HPAs) in structures Na2[Pd(NH3)4]5 (Mo7—xWxO24)2·nH2O, where x = 3.50 and 3.37, n = 19.5 and 16, respectively, (hereinafter 1 and 2) and Na[Pd(NH3)4]2(HMo3.75W3.25O24)·7H2O (hereinafter 3) are established. The Na+ cations act as bridges. Structures 1 and 2 are formed with the participation of two types of Na+ cations: one type links the neighboring heptapolyanions into dimers (Na…O distances are 2.338-2.425 Å); the coordination environment of the second type of Na+ cations includes two O atoms of the HPA (Na…O distances are 2.402 Å and 2.451 Å) and three O atoms of water molecules (Na…O distance is 1.963-2.499 Å). In structure 3, all HPAs are connected into zigzag chains by bridging Na+ cations (Na…O distances are 2.283-2.728 Å). Despite different HPA compositions and charges, the sites of M atoms (Mo or W) are not statistically occupied: W atoms tend to occupy the sites whose surrounding MO6 polyhedron contains no terminal O atoms. The Mo atoms tend to occupy sites that are most distant from the bridging O atoms (~2.4 Å) connecting two M atoms. In general, the Mo/W site occupancies fall within the interval from ~0.85/0.15 to 0.12/0.88.

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Funding

This work was funded by the Ministry of Science and Higher Education of the Russian Federation, projects No. 121031700313-8.

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  1. Nikolaev Institute of Inorganic Chemistry, Siberian Branch, Russian Academy of Sciences, Novosibirsk, Russia

    A. S. Sukhikh & S. A. Gromilov

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  1. A. S. Sukhikh
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  2. S. A. Gromilov
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Correspondence to S. A. Gromilov.

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Russian Text © The Author(s), 2022, published in Zhurnal Strukturnoi Khimii, 2022, Vol. 63, No. 10, 100365.https://doi.org/10.26902/JSC_id100365

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Sukhikh, A.S., Gromilov, S.A. STRUCTURAL REGULARITIES OF MIXED HEPTAANIONS IN STRUCTURES Na2[Pd(NH3)4]5(Mo7–xWxO24)2·nH2O AND Na[Pd(NH3)4]2(HMo3.75W3.25O24)·7H2O. J Struct Chem 63, 1715–1721 (2022). https://doi.org/10.1134/S0022476622100171

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