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|Section2= |Section3= |Section8= }} Tetramethylammonium hydroxide (TMAH or TMAOH) is a quaternary ammonium salt with the molecular formula N(CH3)4+ OH−, and is one of the simplest members of this class of organic compounds. This substance is known in a (relatively) stable solid form only as the pentahydrate. Commercially, the forms in which TMAH is most commonly encountered are as concentrated solutions in water or methanol. The solid and solutions are colorless, or yellowish if impure. Although TMAH has virtually no odor when pure, samples often have a strongly fishy smell from the trimethylamine which is commonly present as an impurity. TMAH has numerous and diverse industrial and research applications (see below). ==Chemistry== It is important to note that ''anhydrous'' TMAH has never been isolated. The only relatively stable solid form in which this substance exists is as the pentahydrate, N(CH3)4OH·5H2O, and this has been assigned the CAS# 10424-65-4. A trihydrate, C4H13NO·3H2O, has also been reported, and this has been assigned the CAS# 10424-66-5. TMAH is most commonly encountered as an aqueous solution, in concentrations from ~2–25%, and less frequently as solutions in methanol. These solutions are identified by the CAS# 75-59-2. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Tetramethylammonium hydroxide」の詳細全文を読む スポンサード リンク
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