Tetramethylammonium hexafluorophosphate

Figure . Fluorescence iqiectra of the dichloromethane phases containing 2.00 X 10 M crown 4 after equilibration with aqueous solutions with the concentrations of KCl shown on the Figure. All aqueous phases initially have 2.00 X 10 M tetramethylammonium hexafluorophosphate and pH s set to ll.S using tetraethylammonium hydroxide.

There is both direct and indirect evidence for parts of this proposed reaction path. Tetramethylammonium chloride dissolves in a solution of phosphorus pentachloride in acetonitrile to give tetramethylammonium hexachlorophosphate (33). As stated in Section II, B the reaction of ammonium fluoride with phosphorus pentachloride yields the very stable ammonium hexafluorophosphate. Ammonium chloride, though virtually... 

TBAH tetrabutylammonium hexafluorophosphate TBAP tetrabutylammonium perchlorate TMAB tetramethylammonium tetrafluoroborate. In comparisons of reduction potentials, the following conversion factors are used E(FeCp2 /FeCp2)=E(NHE) — 0.665=E(SCE) — 0.424=E (Ag/AgNOs)-0.105... 

Interestingly, TMAC, although it is insoluble in 2-pyrrolidone, apparently reacts with py-K/C02 and influences the outcome of the polymerization. On the other hand, other insoluble onium salts, such as tetramethylammonium perchlorate, tetrafluoro-borate, and hexafluorophosphate, are unreactive and give approximately the same conversion and molecular weight as the control run without onium salt. Anong the soluble onium salts tested, tetraethylammonium chloride and tetramethylammonium acetate are quite effective to increase conversion and molecular weight but are not better than the insoluble TMAC (Table IV). 

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