Abstract
WF6 reacts with HOCH2CF3 to form F5W–OCH2CF3 and cis-WF4(OCH2CF3)2. CsF is added to F5WOCH2CF3, yielding the heptacoordinated anion [F6WOCH2CF3]−, which has a capped octahedral structure with the oxygen ligand in an equatorial position. The first step of the reaction of WF6 with HN(CH2CF3)2 results in F5WN(CH2CF3)2. Excess HN(CH2CF3)2 causes deprotonation, yielding the heptacoordinated [F5W(η2CF3–CHN–CH2CF3)]− anion. This can be described as a tungstaazacyclopropane derivative or a π complex between F5W− and CF3–CHN–CH2CF3. The only case in which MoF6 reacts similarly is the formation of F5Mo–OCH2CF3.
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