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Syntheses, Structure and Characterization of Three New Mg-containing Phosphates with Deep-UV Cut-off Edges

Abstract

Three new Mg-containing phosphates AMg2P3O10 (A = Li, Cs) and Rb2MgP2O7 have been successfully synthesized by high temperature solution method. The single crystal X-ray diffractions show they crystallize in different space groups, P21/m for LiMg2P3O10, Pbcn for CsMg2P3O10 and Pnma for Rb2MgP2O7. Interestingly, their structures contain two different types of P-O connect modes, i.e. P3O10 trimers in AMg2P3O10 (A = Li, Cs) and P2O7 dimers in Rb2MgP2O7. Correspondingly, the Mg2+-centered polyhedra also exhibit three different polymerizations, including one-dimensional (1D) [MgO6]∞ infinite chains in LiMg2P3O10, the Mg2O8 dimers in CsMg2P3O10 and the isolated MgO5 square pyramids in Rb2MgP2O7. Detailed structural analysis indicates that the different size of A-site cations and flexible coordination of Mg2+ cations are responsible for the structural differences. Furthermore, the optical measurements of three compounds show that they all possess deep-UV absorption cut-off edges (< 190 nm). And their thermal properties and the bond valence sum difference map (BVS-DM) calculations are also studied.

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Supplementary files

Article information


Submitted
20 Dec 2019
Accepted
16 Mar 2020
First published
17 Mar 2020

New J. Chem., 2020, Accepted Manuscript
Article type
Paper

Syntheses, Structure and Characterization of Three New Mg-containing Phosphates with Deep-UV Cut-off Edges

Z. Qian, H. Wu, H. Yu, Z. Hu, J. Wang and Y. Wu, New J. Chem., 2020, Accepted Manuscript , DOI: 10.1039/C9NJ06311K

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