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Tetramethylammonium hydrogensulfate hydrate is generally used as a phase transfer catalyst. It can also be used as a derivatizing agent for gas chromatography-mass spectrometry (GC-MS)
Application. Tetramethylammonium hydrogensulfate hydrate is generally used as a phase transfer catalyst. It can also be used as a derivatizing agent for gas chromatography-mass spectrometry (GC-MS) applications.
Tetramethylammonium hydroxide (TMAH or TMAOH) is a quaternary ammonium salt with the molecular formula N(CH3)4+ OH−. It is commonly encountered as concentrated solutions in water or methanol. The solid and solutions are colorless, or yellowish if impure.
TMAH solution is widely used in the electronics industry as a developer or cleaner. TMAH is typically one of several ingredients in etching / stripping mixtures, although it may also be used as a pure chemical. It is often used in solution in water, and less frequently, in methanol.