Effect of the cation size on the framework structures of magnesium tungstate, A4Mg(WO4)3 (A = Na, K), R2Mg2(WO4)3 (R = Rb, Cs)

Shujuan Han; Ying Wang; Qun Jing; Hongping Wu; Shilie Pan; Zhihua Yang

doi:10.1039/C5DT00332F

Effect of the cation size on the framework structures of magnesium tungstate, A₄Mg(WO₄)₃ (A = Na, K), R₂Mg₂(WO₄)₃ (R = Rb, Cs)†

Shujuan Han,^a Ying Wang,^ab Qun Jing,^ab Hongping Wu,^a Shilie Pan*^a and Zhihua Yang*^a

* Corresponding authors

^a Key Laboratory of Functional Materials and Devices for Special Environments of CAS; Xinjiang Key Laboratory of Electronic Information Materials and Devices; Xinjiang Technical Institute of Physics & Chemistry of CAS, 40-1 South Beijing Road, Urumqi 830011, China
E-mail: slpan@ms.xjb.ac.cn, zhyang@ms.xjb.ac.cn

^b University of Chinese Academy of Sciences, Beijing 100049, China
Fax: +(86)-991-3838957
Tel: +(86)-991-3674558

Abstract

A series of alkali metal magnesium tungstates, A₄Mg(WO₄)₃ (A = Na, K), R₂Mg₂(WO₄)₃ (R = Rb, Cs), were synthesized from a high temperature solution, and their structures were determined by single-crystal X-ray diffraction. Interestingly, Na₄Mg(WO₄)₃ crystallizes in the monoclinic space group C2/c, while K₄Mg(WO₄)₃ having an identical stoichiometry with Na₄Mg(WO₄)₃, exhibits a different framework structure belonging to triclinic symmetry with the space group P [1 with combining macron] . Isostructural Rb₂Mg₂(WO₄)₃ and Cs₂Mg₂(WO₄)₃ crystallize in the space group P2₁3 of cubic symmetry and reveal a three dimensional framework composed of isolated WO₄ tetrahedra, MgO₆ octahedra and RO₁₂ (R = Rb, Cs) polyhedra. The effect of the alkali metal cation size on the framework structures of magnesium tungstate has been discussed in detail. In addition, the infrared spectra, as well as the UV-Vis-NIR diffuse reflectance spectroscopy data, are reported. The first-principles theoretical studies are also carried out to aid the understanding of electronic structures and linear optical properties.

Article information

https://doi.org/10.1039/C5DT00332F

Article type

Paper

Submitted

24 Jan 2015

Accepted

07 Feb 2015

First published

11 Feb 2015

Download Citation

Dalton Trans., 2015,44, 5810-5817

Permissions

Request permissions

Effect of the cation size on the framework structures of magnesium tungstate, A₄Mg(WO₄)₃ (A = Na, K), R₂Mg₂(WO₄)₃ (R = Rb, Cs)

S. Han, Y. Wang, Q. Jing, H. Wu, S. Pan and Z. Yang, Dalton Trans., 2015, 44, 5810 DOI: 10.1039/C5DT00332F

To request permission to reproduce material from this article, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

Dalton Transactions