Tetramethylammonium hydroxide

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Tetramethylammonium hydroxide (TMAH or TMAOH) is a quaternary ammonium salt with molecular formula N(CH3)4+OH−, abbreviated NMe4+OH−, where Me stands for the methyl group, –CH3. It is commonly encountered in the form of concentrated solutions in water or methanol. TMAH in solid state and its aqueous solutions are all colorless, but may be yellowish if impure. Although TMAH has virtually no odor when pure, samples often have a strong fishy smell due to presence of trimethylamine, which is a common impurity. TMAH has several diverse industrial and research applications.

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