Abstract
The compound (PPh 4) 3Ag[WF 5(C 2I 2)] 2 is formed by the reaction of PPh 4[WCl 5(C 2I 2)] with an excess of silver fluoride in acetonitrile. The compound is soluble in CH 2Cl 2; when CCl 4 is added single red crystals are obtained. The complex is characterized by its IR spectrum and by an X-ray structural study (4060 observed, independent reflexions, R = 0.105). Crystal data: orthorhombic, space group P2 12 12, Z = 2, a 4464(2), b 1074(1), c 777,6(4) pm. The compound consists of PPh 4 + and Ag + ions, and the anions [WF 5(C 2I 2)] 2−, in which the tungsten atoms are seven-coordinated by five fluorine atoms and two carbon atoms. The diiodoacetylene ligand is symmetrically bonded sideways to the tungsten atom. The four equatorial F atoms have WF bond lengths of 191 pm, whereas the fluorine atom in trans-position to the WC 2 group is located 199 pm from the metal centre. The PPh 4 + ions are stacked in parallel columns.
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