Abstract
Abstract The product of the interaction of silicon tetrafluoride with a solution of 18-crown-6 in hexane has been obtained. The composition and structure of the compound [(trans-SiF4.2H2O).18C6.2H2O] (complex I) have been determined by X-ray methods. The compound (I) is monoclinic, space group P21/a, a = 15.484(5), b = 9.651(3), c = 7.795(2) A, γ = 121.45(3)°, Z = 2 for the composition C12H32F4O10Si. In the crystal of (I) the polymer-like structure is realized where water and [trans-SiF4.2H2O] moieties are connected with the host and between each other by the system of O-H … O hydrogen bonds. O(H) … O distances are in the limits 2.60(1)–2.91(1) A. It was proved that in the process of crown ether complexation the hydratation of SiF4 occurred with the formation of a trans-octahedral [SiF4.2H2O] moiety, Si-F and Si-O distances are equal to 1.658(7) and 1.853(9) A, respectively. Between the individual chains there are only van der Waals interactions.
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