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K4(PO2F2)2(S2O7): first fluorooxophosphorsulfate with mixed-anion [S2O7]2− and [PO2F2]− groups
Dalton Transactions ( IF 3.5 ) Pub Date : 2020-11-03 , DOI: 10.1039/d0dt03307c
Wenyao Zhang 1, 2, 3, 4, 5 , Wenqi Jin 1, 2, 3, 4, 5 , Zhihua Yang 1, 2, 3, 4, 5 , Shilie Pan 1, 2, 3, 4, 5
Affiliation  

Mixed-anion compounds are among the most promising systems to design functional materials with enhanced properties. Among the phosphate–sulfate species, the [SO4]2− and [PO2F2] tetrahedra are known and give rise to structural versatility. However, to date, the crystal structures of phosphate–sulfates with the coexistence of two distinct anion groups ([S2O7]2− and [PO2F2]) in one compound are unknown. Here, a novel type of fluorooxophosphorsulfate, K4(PO2F2)2(S2O7) (KSPOF), is designed and synthesized via a high-temperature method in a closed system. The crystal structure is derived from single-crystal X-ray diffraction (C2/c, a = 13.000(10) Å, b = 7.5430(10) Å, c = 19.010(10) Å, β = 130.070(10)°, and Z = 4). It is the first fluorooxophosphorsulfate with mixed-anion building units ([S2O7]2− and [PO2F2]) and a unique drum-like cluster was found, which enriches the diversity of structures for fluorooxophosphorsulfate systems. Furthermore, the theoretical calculations indicate that KSPOF possesses moderate birefringence, which mainly originates from the distorted [PO2F2] tetrahedron.

中文翻译:

K4(PO2F2)2(S2O7):带有混合阴离子[S2O7] 2-和[PO2F2]-的氟代氟代磷酸酯

混合阴离子化合物是设计具有增强性能的功能材料的最有希望的系统之一。在磷酸盐-硫酸盐类中,[SO 4 ] 2−和[PO 2 F 2 ] 四面体是已知的,并引起结构的多功能性。然而,迄今为止,在一个化合物中具有两个不同阴离子基团([S 2 O 7 ] 2−和[PO 2 F 2 ] )共存的磷酸硫酸盐的晶体结构尚不清楚。在这里,一种新型的氟代氧代磷酸硫酸盐K 4(PO 2 F 22(S 2 O 7)(KSPOF)是在密闭系统中通过高温方法设计和合成的。晶体结构来自单晶X射线衍射(C 2 / ca = 13.000(10)Å,b = 7.5430(10)Å,c = 19.010(10)Å,β = 130.070(10)° ,并且Z = 4)。这是第一个带有混合阴离子结构单元([S 2 O 7 ] 2-和[PO 2 F 2 ] -),并发现了一个独特的鼓状簇,它丰富了氟代磷酸亚硫酸盐体系的结构多样性。此外,理论计算表明,KSPOF具有适度的双折射,这主要源自扭曲的[PO 2 F 2 ] -四面体。
更新日期:2020-11-25
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