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

• 作者: YANG Dong ZHUANG Rong-Chuan MI Jin-Xiao HUANG Ya-Xi
• 来源期刊: 结构化学
• 年，卷（期）: 2021,（1）
• 所属期刊栏目: organic and inorganic structural cbemistry
• 页码范围: 114-124
• 页数: 11页
• 语种: 英文
• DOI: 10.14102/j.cnki.0254-5861.2011-2773

摘要

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)?,V = 935.73(15)?3,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)?,V= 678.56(11)?3,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 ℃ forNa3[Ge(OH)(PO4)2]·2H2O.