Crystal structures of the hexachlorometalates NH4[SbCl6], NH4[WCl6], [K(18-crown-6)(CH2Cl2)](2)[WCl6]center dot 6CH(2)Cl(2) and (PPh4)(2)[WCl6]center dot 4CH(3)CN [German]

摘要

The crystal structures of the title compounds were determined by single crystal X-ray methods. NH4[SbCl6] and NH4[WCl6] crystallize isotypically in the space group C2/c with four formula units per unit cell. The NH4+ ions occupy a twofold crystallographic axis, whereas the metal atoms of the [MCl6](-) ions occupy a centre of inversion. There exist weak interionic hydrogen bridges. [K(18-crown-6)(CH2Cl2)](2)[WCl6](.)6CH(2)Cl(2) crystallizes in the orthorhombic space group R3/m with Z = 3. The compound forms centrosymmetric ion triples, in which the potassium ions are coordinated with a WCl3 face each. In trans-position to it the chlorine atom of a CH2Cl2 molecule is coordinated so that, together with the oxygen atoms of the crown ether, coordination number 10 is achieved. (PPh4)(2)[WCl6](.)4CH(3)CN crystallizes in the monoclinic space group P2(1)/c with Z = 4. This compound, too, forms centrosymmetric ion triples, in which in addition the acetonitrile molecules are connected with the [WCl6](2-) ion via weak C-(HCl)-Cl-... contacts. [References: 24]