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Elaboration, étude structurale et analyse CHARDI et BVS d'une nouvelle variété β-Na9Cr(MoO4)6 de type alluaudite

By Manel Sonni, Riadh Marzouki, Mohamed Faouzi Zid and Amira Souilem

Abstract

The title compound, nonasodium chromium(III) hexakis[molybdate(VI)], β-Na9CrMo6O24, was prepared by solid-state reactions. This alluaudite-type structure is constituted of infinite layers formed by links between M2O10 (M = C/Na) dimers and MoO4 tetrahedra. The Na+ and Cr3+ cations are located in the same site with, respectively, 0.25 and 0.75 occupancies. The layers are connected to each other through MoO4 sharing corners, resulting an in open three-dimensional framework with hexagonal-form cavities occupied by Na+ cations. The proposed structural model is supported by charge-distribution (CHARDI) and bond-valence-sum (BVS) analysis. All atoms are on general positions except for one Mo, two Na (site symmetry 2) and another Na site (site symmetry -1). A comparison is made with the similar structures Na4Co(MoO4)3, Na2Ni(MoO4)2, Cu1.35Fe3(PO4)3 and NaAgFeMn2(PO4)3

Topics: crystal structure, alluaudite structure, framework, BVS, CHARDI, Chemistry, QD1-999
Publisher: International Union of Crystallography
Year: 2016
DOI identifier: 10.1107/S205698901600774X
OAI identifier: oai:doaj.org/article:77fe684456b74e67b0baef1bfa8caae2
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