[Mg(XeF₂)ₙ](AsF₆)₂（n = 4, 2）：镁与二氟化氙形成的首批化合物

[Mg(XeF(2))(n)()](AsF(6))(2) (n = 4, 2): first compounds of magnesium with XeF(2).

作者信息

Tramsek Melita, Benkic Primoz, Zemva Boris

机构信息

Department of Inorganic Chemistry and Technology, Jozef Stefan Institute, Jamova 39, SI-1000 Ljubljana, Slovenia.

出版信息

Inorg Chem. 2004 Jan 26;43(2):699-703. doi: 10.1021/ic034826o.

DOI:10.1021/ic034826o

PMID:14731032

Abstract

The reaction between Mg(AsF(6))(2) and XeF(2) in anhydrous HF (aHF) at room temperature yields two compounds with XeF(2) bonded directly to the Mg(2+) cation: Mg(XeF(2))(4)(2); Mg(XeF(2))(2)(2). The 1:4 compound is obtained with excess XeF(2) while the 1:2 compound is prepared from stoichiometric amounts of Mg(AsF(6))(2) and XeF(2). Mg(XeF(2))(4)(2) crystallizes in an orthorhombic crystal system, space group P2(1)2(1)2(1), with a = 8.698(15) A, b = 14.517(15) A, c = 15.344(16) A, V = 1937(4) A(3), and Z = 4. The octahedral coordination sphere of Mg consists of one fluorine atom from each of the four XeF(2) molecules and two fluorine atoms from the two AsF(6) units. Mg(XeF(2))(2)(2) crystallizes in the orthorhombic crystal system, space group Pbam, with a = 8.9767(10) A, b = 15.1687(18) A, c = 5.3202(6) A, V = 724.42(14) A(3), and Z = 2. The octahedral coordination sphere consists of two fluorine atoms, one from each of the two XeF(2) molecules and four fluorine atoms from the four bridging AsF(6) units.

摘要

室温下，在无水氢氟酸（aHF）中，Mg(AsF₆)₂与XeF₂反应生成两种化合物，其中XeF₂直接与Mg²⁺阳离子键合：Mg(XeF₂)₄₂；Mg(XeF₂)₂₂。1:4的化合物是用过量的XeF₂制得的，而1:2的化合物是由化学计量比的Mg(AsF₆)₂和XeF₂制备的。Mg(XeF₂)₄₂结晶于正交晶系，空间群P2₁2₁2₁，a = 8.698(15) Å，b = 14.517(15) Å，c = 15.344(16) Å，V = 1937(4) Å³，Z = 4。Mg的八面体配位球由四个XeF₂分子中各一个氟原子以及两个AsF₆单元中的两个氟原子组成。Mg(XeF₂)₂₂结晶于正交晶系，空间群Pbam，a = 8.9767(10) Å，b = 15.1687(18) Å，c = 5.3202(6) Å，V = 724.42(14) Å³，Z = 2。八面体配位球由两个氟原子组成，一个来自两个XeF₂分子中的每一个，以及四个来自四个桥连AsF₆单元的氟原子。