Citation: Dong YANG, Rong-Chuan ZHUANG, Jin-Xiao MI, Ya-Xi HUANG. Two Alkali Metal Germanophosphates Na₃[Ge(OH)(PO₄)₂]·2H₂O and Li₂Na[GeO(HPO₄)(PO₄)]: Crystal Structures and Thermal Stability[J]. Chinese Journal of Structural Chemistry, ;2021, 40(1): 114-124. doi: 10.14102/j.cnki.0254–5861.2011–2773 shu

Two Alkali Metal Germanophosphates Na₃[Ge(OH)(PO₄)₂]·2H₂O and Li₂Na[GeO(HPO₄)(PO₄)]: Crystal Structures and Thermal Stability

a.
Fujian Key Laboratory of Advanced Materials (Xiamen University), Department of Materials Science and Engineering, College of Materials, Xiamen University, Xiamen 361005, China
b.
State Key Laboratory of Comprehensive Utilization of Low-grade Refractory Gold Ores, Shanghang 364200, China

Corresponding author: Ya-Xi HUANG, yaxihuang@xmu.edu.cn
Received Date: 19 February 2020
Accepted Date: 8 May 2020

Fund Project: the National Natural Science Foundation of China 21201144

Figures(6)

Two new alkali metal germanophosphates, namely, Na₃[Ge(OH)(PO₄)₂]·2H₂O and Li₂Na[GeO(HPO₄)(PO₄)], have been prepared by solvothermal method, and their crystal structures were determined by single-crystal X-ray diffraction. The title two compounds crystalize in the same orthorhombic space group Pbcm (No. 57) and feature similar chain-like structure which is built from zig-zag GeO₆ octahedral thread loop branched by PO₄ tetrahedra. For Na₃[Ge(OH)(PO₄)₂]·2H₂O, a = 10.1650(9), b = 13.1975(12), c = 6.9751(7) Å, V = 935.73(15) Å³, Z = 4, R = 0.0356 and wR = 0.1109; and for Li₂Na[GeO(HPO₄)(PO₄)], a = 6.9855(5), b = 14.5809(18), c = 6.6620(5) Å, V = 678.56(11) Å³, Z = 4, R = 0.0286, and wR = 0.0762. The partial substitution of Na ions by Li ions not only significantly influences the total structural features and the water molecule contents, but also impacts on their thermal stabilities. Li₂Na[GeO(HPO₄)(PO₄)] is thermally stable up to 400 ℃, whereas only 150 ℃ for Na₃[Ge(OH)(PO₄)₂]·2H₂O.
- alkali metal,
- chain-like structure,
- germanophosphates,
- thermal stability
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Two Alkali Metal Germanophosphates Na3[Ge(OH)(PO4)2]·2H2O and Li2Na[GeO(HPO4)(PO4)]: Crystal Structures and Thermal Stability

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通讯作者: 陈斌, bchen63@163.com

Two Alkali Metal Germanophosphates Na₃[Ge(OH)(PO₄)₂]·2H₂O and Li₂Na[GeO(HPO₄)(PO₄)]: Crystal Structures and Thermal Stability