A series of open-framework tin(II) phosphates: A[Sn4(PO4)3] (A=Na,K, NH4) |
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| Affiliation: | 1. School of Chemistry, Physics and Mechanical Engineering, Science and Engineering Faculty, Queensland University of Technology, GPO Box 2434, Brisbane, Queensland 4001, Australia;2. Geology Department, School of Mines, Federal University of Ouro Preto, Campus Morro do Cruzeiro, Ouro Preto, MG 35,400-000, Brazil;1. Polymer Synthesis and Analysis Laboratory, Department of Chemistry, Çanakkale Onsekiz Mart University, 17020 Çanakkale, Turkey;2. Secondary Science and Mathematics Education, Faculty of Education, Çanakkale Onsekiz Mart University, 17100 Çanakkale, Turkey;1. National Engineering Laboratory for High Efficiency Recovery of Refractory Nonferrous Metals, School of Metallurgy and Environment, Central South University, Changsha, 410083, PR China;2. Chengdu Development Center of Science and Technology, China Academy of Engineering Physics, Chengdu, 610200, PR China;1. Institute for Superconducting and Electronic Materials, University of Wollongong, Wollongong, NSW, 2522, Australia;2. College of Chemical Engineering, Sichuan University, Chengdu, 610065, PR China;3. University of Babylon, College of education for pure sciences, Babylon, Iraq;1. School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin, 150001, PR China;2. Tianneng Shuai Fude Energy Co. Ltd, Tian Neng Group, Huzhou, 313100, PR China;3. School of Environment, Harbin Institute of Technology, Harbin, 150001, PR China;1. School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin 150001, PR China;2. Wolong Electric Group Zhejiang Dengta Power Source Co., Ltd, PR China |
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| Abstract: | 
A new series of isostructural open-framework tin(II) phosphates with general formula A[Sn4(PO4)3], where A=Na, K, NH4, has been synthesized by hydrothermal methods. The crystal structures of NaSn4(PO4)3 (I) and KSn4(PO4)3 (II) have been solved by single crystal X-ray diffraction methods. Both phases crystallize in the trigonal space group R3c (#161) with Z=6 and cell parameters a=9.5508(13) Å, c=24.083(3) Å for I, and a=9.7124(11) Å, c=24.363(3) Å for II. The structure consists of a negatively charged [Sn4(PO4)3]− framework with channels running parallel to the a- and b-axes where the charge compensating A+ cations are located. An interesting feature is that half of the channels are empty due to the specific geometry of the SnO3 units—the lone electron pair of the tin atoms “protrudes” in these channels thus preventing the insertion of A+. The new phases have also been characterized by infrared and thermogravimetric analyses. |
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