Tetramethylammonium hydroxide pentahydrate


Linear Formula:
(CH3)4N(OH) · 5H2O
CAS Number:
Molecular Weight:
Beilstein/REAXYS Number:
EC Number:
MDL number:
PubChem Substance ID:

Quality Level

vapor density

1.1 (vs air)





autoignition temp.

878 °F

mol wt

181.23 g/mol

expl. lim.

36 %


67-70 °C (lit.)

SMILES string




InChI key


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General description

Tetramethylammonium hydroxide pentahydrate is a clathrate hydrate which has been found to be a fast “proton” or “hydroxide ion” conductor.


Tetramethylammonium hydroxide pentahydrate has been used in a study to assess strains of Pseudomnas species by a single-step gas chromatographic characterization procedure. It has also been used in a study to investigate solid-state metal hydride batteries nickel oxyhydroxide-metal hydride and manganese dioxide-metal hydride.


1 kg in glass bottle
5, 25, 100 g in glass bottle

Signal Word


Target Organs

Central nervous system

Personal Protective Equipment

dust mask type N95 (US),Eyeshields,Gloves


UN 3423 8 / PGII

WGK Germany


Flash Point(F)

Not applicable

Flash Point(C)

Not applicable

Certificate of Analysis

Certificate of Origin

Solid-state metal hydride batteries using tetramethylammoniumhydroxidepentahydrate
Kuriyama, N., et al.
Solid State Ionics, 53-56, 688-688 (1992)
High conductivity and phase transitions of tetramethylammoniumhydroxidepentahydrate, (CH3)4NOH?5H2O
Kuriyama, N., et al.
Solid State Ionics, 40-41, 906-906 (1990)
T J Wade et al.
Applied microbiology, 27(2), 303-311 (1974-02-01)
Strains of saccharolytic and nonsaccharolytic Pseudomonas species were examined by a new single-step gas chromatographic characterization procedure. Cells were digested in a methanolic solution of tetramethylammonium hydroxide pentahydrate, and the digestates were subjected to gas-liquid chromatographic analysis. The chromatograms were...
Wei Shen et al.
Chemical communications (Cambridge, England), 49(73), 8114-8116 (2013-08-08)
A simple and low-cost colorimetric assay utilizing ferrofluidic nanoparticulate probes (FNPs) and a ligase for single-nucleotide polymorphism genotyping is described. Excellent sensitivity and selectivity were accomplished through the engagement of the FNPs and a ligase chain reaction.
Marco I Ries et al.
The Journal of biological chemistry, 288(52), 37289-37295 (2013-11-15)
Metabolic profiling and structural elucidation of novel secondary metabolites obtained from derived deletion strains of the filamentous fungus Penicillium chrysogenum were used to reassign various previously ascribed synthetase genes of the roquefortine/meleagrin pathway to their corresponding products. Next to the...

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