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Ammonium thiocyanate is stable in air; however, upon heating it isomerizes to thiourea: The equilibrium mixtures at 150 °C and 180 °C contain 30.3% and 25.3% (by weight) thiourea, respectively. When heated at 200 °C, the dry powder decomposes to ammonia, hydrogen sulfide, and carbon disulfide, leaving a residue of guanidinium thiocyanate.
Chemical formula. SC(NH 2) 2 Molar mass: 76.12 g·mol −1 Appearance white solid ... Thiourea exists in dynamic equilibrium with ammonium thiocyanate at 150 °C ...
[7] [8] [9] Thus the complete absence of thiocyanate or reduced thiocyanate [10] in the human body, (e.g., cystic fibrosis) is damaging to the human host defense system. [11] [12] Thiocyanate is a potent competitive inhibitor of the thyroid sodium-iodide symporter. [13] Iodine is an essential component of thyroxine. Since thiocyanates will ...
Thiocyanate complexes are not widely used commercially. Possibly the oldest application of thiocyanate complexes was the use of thiocyanate as a test for ferric ions in aqueous solution. Addition of a thiocyanate salt to a solution containing ferric ions gives a deep red color. The identity of the chromophore remains unknown. [15]
In methyl thiocyanate, N≡C and C−S distances are 116 and 176 pm. By contrast, N=C and C=S distances are 117 and 158 pm in isothiocyanates. [7] Typical bond angles for C−S−C are 100°. [3] By contrast C−N=C in aryl isothiocyanates is 165°. Again, the thiocyanate isomers are quite different with C−S−C angle near 100°.
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.
The most common use of silver thiocyanate is as a silver nanoparticle. Silver thiocyanate nanoparticles have been found in saliva throughout the entire artificial digestion of silver nitrate. [9] The nanoparticles can also be used as good ion conductors. [10] Silver thiocyanate has also been used to absorb uv-visible light at values less than ...
The cyanate ion is an anion with the chemical formula OCN −. It is a resonance of three forms: [O − −C≡N] (61%) ↔ [O=C=N − ] (30%) ↔ [O + ≡C−N 2− ] (4%). Cyanate is the derived anion of isocyanic acid , H−N=C=O, and its lesser tautomer cyanic acid (a.k.a. cyanol), H−O−C≡N.