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Tetramethylammonium (TMA) is the simplest quaternary ammonium cation. It has the chemical formula [Me 4 N] + and consists of four methyl groups (−CH 3, denoted Me) attached to a central nitrogen atom. The cation is isoelectronic with neopentane (Me 4 C). It is positively-charged and can only be isolated in association with a counter-ion.
Tetramethylammonium hydroxide (TMAH or TMAOH) is a quaternary ammonium salt with molecular formula N(CH 3) 4 + OH −. It is commonly encountered in 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.
Tetramethylammonium chloride is a major industrial chemical, being used widely as a chemical reagent [1] and also as a low-residue bactericide in such processes as hydrofracking. [2] In the laboratory, it has fewer synthetic chemical applications than quaternary ammonium salts containing longer N-alkyl substituents, which are used extensively ...
Tetramethylammonium fluoride is the quaternary ammonium salt with the formula (CH 3) 4 NF. This hygroscopic white solid is a source of “naked fluoride": fluoride ions not complexed with a metal atom.
Tetramethylammonium pentafluoroxenate is a chemical compound with the chemical formula [N(CH 3) 4] + [XeF 5] −. This salt consists of tetramethylammonium cations [N(CH 3) 4] + and pentafluoroxenate(IV) anions [XeF 5] −. The [XeF 5] − ion was the first example of a pentagonal planar molecular geometry AX 5 E 2 species. [1]
Tetramethylammonium auride, (CH 3) 4 NAu, is an ionic compound containing tetramethylammonium as cation and gold in a –1 oxidation state as anion. It is an example of a compound containing this rare ionic form of gold , and the first auride paired with a cation that is not a metal atom that has been synthesized.
Trimethylamine is used in the synthesis of choline, tetramethylammonium hydroxide, plant growth regulators, herbicides, strongly basic anion exchange resins, dye leveling agents and a number of basic dyes. [5] [6] Gas sensors to test for fish freshness detect trimethylamine.
In common with tetraethylammonium chloride and tetraethylammonium iodide, TEAB has been used as a source of tetraethylammonium ions for numerous clinical and pharmacological studies, which are covered in more detail under the entry for tetraethylammonium.
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