I was thinking about a compound resembling HX2SOX4 but more acidic. I thought to replace the 2 oxygens with 4 fluorine atoms getting HX2SOX2FX4, which might be more acidic. Does such a compound even exist?
I also tried searching another compound i.e. HOSFX5 thinking of it to be more acidic than the previous but no results.
Answer
As the comments imply, no dice. You can, of course, make a six-coordinate sulfur compound with the formula SFX6. But trying it with a mixture of oxide, hydroxide and fluoride ligands instead of just fluoride presents the opportunity to evolve HF leaving the sulfur with a lower coordination number. There is a five-coordinate compound SOFX4, but otherwise you should expect the sulfur to get down to four-coordination. So the only stable protic acids you can get with one sulfur atom and oxide, hydroxide and fluoride ligands are plain old HX2SOX4 and the more strongly acidic HSOX3F.
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