Synthesis, crystal structure and charge-distribution validation of β-Na4Cu(MoO4)3 adopting the alluadite structure-type

Acta Crystallographica Section E: Crystallographic Communications

Zid, M.F.¹  Dridi, W.¹ 

[1] Laboratoire de Matériaux et Cristallochimie, Faculté des Sciences de Tunis, Université de Tunis El Manar, 2092 El Manar Tunis, Tunisia

关键词: CRYSTAL STRUCTURE;    BVS;    CHARDI;    ALLUAUDITE-TYPE;    SODIUM;    COPPER(II);    MOLYBDATE(VI);   

DOI  :  10.1107/S2056989016010367

学科分类：数学（综合）

来源: International Union of Crystallography

【 摘 要 】

Single crystals of a new variety of tetra­sodium copper(II) tris­[molybdate(VI)], Na4Cu(MoO4)3, have been synthesized by solid-state reactions and characterized by single-crystal X-ray diffraction. This alluaudite structure-type is characterized by the presence of infinite layers of composition (Cu/Na)2Mo3O14 parallel to the (100) plane, which are linked by MoO4 tetra­hedra, forming a three-dimensional framework containing two types of hexa­gonal channels in which Na+ cations reside. The Cu2+ and Na2+ cations are located at the same general site with occupancies of 0.5. All atoms are on general positions except for one Mo, two Na (site symmetry 2) and another Na (site symmetry -1) atom. One O atom is split into two separate positions with occupancies of 0.5. The title compound is isotypic with Na5Sc(MoO4)4 and Na3In2As3O12. The structure model is supported by bond-valence-sum (BVS) and charge-distribution CHARDI methods. β-Na4Cu(MoO4)3 is compared and discussed with the K4Cu(MoO4)3 and α-Na4Cu(MoO4)3 structures.

【 授权许可】

CC BY