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CAS 10424-65-4

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Tetramethylammonium hydroxide pentahydrate

Description:
Tetramethylammonium hydroxide pentahydrate (TMAH) is a quaternary ammonium compound with the chemical formula (CH₃)₄NOH·5H₂O. It appears as a colorless to pale yellow solid that is highly soluble in water, forming a strongly alkaline solution. TMAH is known for its strong basicity, which is attributed to the presence of the hydroxide ion. This compound is commonly used in various applications, including as a developer in photolithography processes in the semiconductor industry, as well as in organic synthesis and as a reagent in analytical chemistry. Due to its strong alkaline nature, TMAH can be corrosive and poses health hazards, necessitating careful handling and appropriate safety measures. It can also act as a surfactant and is utilized in some cleaning applications. The pentahydrate form indicates that it contains five molecules of water, which can influence its physical properties and stability. Overall, TMAH is a versatile chemical with significant industrial relevance, but it requires caution due to its corrosive characteristics.
Formula:C4H12N·5H2O·HO
InChI:InChI=1S/C4H12N.6H2O/c1-5(2,3)4;;;;;;/h1-4H3;6*1H2/q+1;;;;;;/p-1
InChI key:InChIKey=MYXKPFMQWULLOH-UHFFFAOYSA-M
SMILES:[N+](C)(C)(C)C.[OH-].O
Synonyms:
  • Ammonium, tetramethyl-, hydroxide, pentahydrate
  • Methanaminium, N,N,N-trimethyl-, hydroxide, hydrate (1:1:5)
  • Methanaminium, N,N,N-trimethyl-, hydroxide, pentahydrate
  • N,N,N-trimethylmethanaminium hydroxide
  • N,N,N-trimethylmethanaminium hydroxide hydrate (1:1:5)
  • Tetramethylammonium hydroxide pentahydrate
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